When the Olsen twins—the "Trollsens," as PETA calls them—trotted out a fur backpack, there wasn't a chance that Running Russell Simmons star and animal advocate extraordinaire Simone Reyes was going to let it pass without a comment. She blasted the Trollsens on her blog, saying that they are "unfortunately using their vanity and the pursuit of making a blessed buck at the expense of innocent sentient beings." Russell Simmons jumped in to help, tweeting Simone's blog.

The Trollsens could take a cue from Banana Republic, which is launching a line inspired by the costumes in the upcoming film Anna Karenina that will be designed with elegant velvet, lace, and faux fur.

You won't catch Constance Marie wearing animals or gawking at them in the rodeo ring. She tweeted, "Please boycott rodeos! #Video shows #Reno rodeo horses being shocked to perform: bit.ly/LLoUot #CrueltyIsNotEntertainment."

Horror movie king Eli Roth knows that what's really horrific is when animals are abused for entertainment. He tweeted in defense of elephants: "Elephants need you! Urge the Atlanta City Council to pass a total bullhook ban! bit.ly/LFIivF #NeverBeSilent."

Photo: Robert Sebree  Grooming: Cheri Keating/The Wall Group  Animatronic Snake: Greg Nicotero/ KNB EFX Group

Vegan pitcher Pat Neshek knows that people provide the best entertainment: The talented Norfolk Tides player just snagged Pitcher of the Week honors.

To keep up with what the stars are doing for animals, follow @PETA on Twitter. 

Olympian Michael Phelps adopted his new pooch, Stella, and promptly started honing her ability to swim. We're sure Michael already qualifies as a hero to Stella even before the London games!

Paul McCartney has schooled many a musician in rock 'n' roll, and now he wants to school children in going vegetarian. He's encouraging schools to join his "Meat Free Mondays" campaign and offer students vegetarian options at lunch.

Black Swan director Darren Aronofsky and Switched at Birth actor Constance Marie joined Paul's chorus, jumping in with the host of other celebs tweeting for animals this week and promoting "Meat Free Mondays" and the veggie life.

The role of WNBA star Candace Parker in the L.A. Sparks' win last Wednesday earned her a Player of the Week nod, but she plays for animals every week by working with PETA to fight fur. 

Photo: Jason Grow/www.jasongrow.com|Hair and makeup: Lauren Genatossio for Team Artist Representative

With another fur foe, Aimee Teegarden, cast in the starring role, you can bet that the CW Television Network's new show, The Selection, billed as "the next Hunger Games," will be decidedly fur-free.

To keep up with what all your fave stars are doing for animals, follow @PETA on Twitter.

Sharon Osbourne told Intermix to get fur out of the mix when she helped Fur Free Los Angeles with a demonstration outside the store. And the host of The Talk isn't all talk—she donated her old furs to PETA several years ago and has been an anti-fur advocate ever since.

Miranda Cosgrove might not be a real talk show host yet, but she does play one on TV. The iCarly star is iCompassionate to animals, telling US Weekly that she never lets anyone kill bugs (she takes them back outdoors) and that she threw a birthday party for her cat.

When Chaka Khan made like a feline, appearing on American Idol in a sultry catsuit, her slimmed-down physique had people wondering what her secret was. Now the legendary singer is spilling the beans (in addition to eating them): She went vegan for her health and dropped 60 pounds in the process.

And two of the sexiest stars alive are teaming up in the summer's sexiest movie, Magic Mike, but Channing Tatum and Olivia Munn are also teaming up to end Ringling's abuse of animals, joining thousands of people in asking the Atlanta City Council to pass a proposed bullhook ban:

While the City Council passed only a partial ban this time, it will be voting on a full ban again soon. 

Twitter cofounders Biz Stone and Evan Williams are putting their money where their beaks are, backing Beyond Meat, a company that produces cruelty-free faux meats. Now, every time cruel meat-peddling companies such as McDonald's use Twitter, they'll actually be helping to support the vegan cause!

Photo: Frank W. Ockenfels 3  For Solo Artist: Hair by David Gardner  Makeup by Spencer Barnes

Tricia Helfer is tweeting to help end the Canadian seal slaughter and wearing her PETA pride on her sleeve chest:

After rescuing a dog himself, Josh Duhamel is a proud rescue advocate: "Pet adoption changed my life when we were looking to find a companion for our 7-year-old dachshund, Zoe. Soon after adopting Meatloaf, I learned that these pets are just grateful for the love you have to give them."

Yvonne Strahovski will be taking her animal rights advocacy to a killer new venue, as she will be appearing on season seven of Dexter, and Waka Flocka Flame's new album, Triple F Life, which debuted this week, is decidedly free of one "f" ("fur") and full of another ("fun").

Last night, the Stand-Up for Animals PETA benefit show at the famous Comedy Store on L.A.'s Sunset Strip was funnier than a barrel of animatronic monkeys.

Bill Maher, Jane Lynch, Carol Leifer, Jeffrey Ross, Marc Maron, and host Fred Willard—in other words, some of the most talented comedians in the world—came together to raise money for PETA and kept the packed house laughing until the audience's sides hurt. 

Guests included Pink, Carey Hart, Olivia Munn, Cloris Leachman, Jorja Fox, Christian Serratos, Renee Olstead, Elisabetta Canalis, Emily Osment, and Moby, many of whom tried valiantly not to do spit takes with The Comedy Store's delicious vegan snacks while laughing at Jeffrey Ross' hysterical poem to his cat or Carol Leifer's explanation that she had to go vegan because being a Jewish lesbian wasn't enough.

Bill Maher quipped, "Before PETA was around, you know, you could f-ck with animals any way, anybody, anytime, anywhere, and now you can't. That's a pretty big change in the world. That's a big achievement. … Animals will not be ignored. They're the Glenn Close of species."

And with all the funds raised by the end of the night, PETA can make sure that animal abusers won't be laughing for long.

Michelle Pfeiffer is known for three decades of film and television roles, Oscar nominations and a Golden Globe, her stunning and ageless beauty, and, now, her cruelty-free diet. She told Dr. Sanjay Gupta on CNN that the evidence pointing to the healthfulness of a vegan diet is so clear that "I couldn't not listen to it."

(c)StarMaxInc

Rani Williamson, aka "Miss Maine USA," might not have snagged the tiara at the Miss USA pageant, but she captured a lot of hearts for promoting vegetarian eating.

Pink's heart belongs to her daughter, Willow Sage, whose first birthday party the singer celebrated with an adorable three-tier vegan cake shaped like baby blocks. 

The book that's veganizing the world, Skinny Bitch, will soon be veganizing the fiction section as well when the new novel Skinny Bitch in Love hits shelves.

Who is likely to be celebrating by vegetarian Fiona Apple's side when her new album comes out this month? Her rescued pit bull mix, Janet, who is her constant companion.

Sophia Bush added a new rescued pit bull mix to her family, and PETA helped her welcome little Griffin with toys, treats, and our "Mutts Rule" T-shirt. 

Leonardo DiCaprio is jumping in to save fins. The actor helped get a ban on shark-finning passed in California, and now he's set his sights on getting a similar bill passed in New York.

To keep up with what the stars are doing for animals, follow @PETA on Twitter.

Twilight actor Nikki Reed celebrated her 24th birthday in Las Vegas—and gave animals a reason to make merry, too—with a birthday party featuring vegan sushi rolls, salads, and chocolate cake from Red Velvet Café. Many happy returns, Nikki!

Be sure to check out The Vegan Vine wines, now owned by NBA legend and PETA pal John Salley. (Aren't all wines vegan? Au contraire.) John reminds us that being a vegan is "the best damn way to eat" (and drink!) "period."

Mary Zilba of The Real Housewives of Vancouver can be counted on never to be silent when it comes to animals in need—and the "No Fur" T-shirt that she's sporting in this picture seems to prove it:

Two famous folks have opened their homes to animals without one—former President George W. Bush adopted a stray cat he named Bob, while actor Jenna Elfman added a rescued puppy to her family—and both received special thank-you packages from PETA.

Some of the biggest names in comedy are raising funds to support PETA's work in Hollywood's hottest ticket, Stand-Up for Animals. (Get your tickets here.) No wonder so many celebrities were all atwitter about it:

To keep up with what the stars are doing for animals, follow @PETA on Twitter.

The Hollywood baby boom is still going, but now it seems that everyone has found something new to go gaga over: cruelty-free food. 

The original Focker, Ben Stiller, and his wife, Christine Taylor, are now vegan and are helping their kids embrace cruelty-free eating, too. "It really has changed our energy level," says Taylor. "Sometimes you don't realize it until someone says it to you, like, 'Your skin looks amazing.'"

Christie Brinkley already knew that. Still stunning at 58, she credits what she eats with giving her supermodel good looks—she's been vegetarian since age 13.

Fellow model and Sexiest Vegetarian alum Lauren Bush Lauren doesn't mince words when talking about her feelings on factory farms. When asked who her mortal enemy was, she responded, "Factory farms, because I am a vegetarian and the thought of innocent animals being raised in poor conditions and then systematically slaughtered is just horrifying to me."

Brad Pitt had some strong words to say about animal slaughter, too. "Ever seen them butcher a cow for hamburger?" he asked reporters at the Cannes Film Festival. "It's incredibly brutal and violent. We live in a very violent world." And Billy Bob Thornton, separated from Brad by only one degree of Kevin Bacon, told Craig Ferguson that he is now mostly vegan. When the stars weren't going vegan this week, they were tweeting for animal rights:

To keep up with what your favorite celebs are doing for animals, follow @PETA on Twitter.

If being on Maxim's Hot 100 list is verifiable proof of hotness (and, of course, it is), these lovely lasses are steaming:

Photo: Hama Sanders/www.hamasanders.com  Hair: Steven Lake for Exclusive Artists  Makeup: Julie Cuomo  Wardrobe: April Steiner for Exclusive Artists  Elephant background: (c) iStockphoto.com/Bruno Buongiorno Nardelli

2. Olivia Munn: Working to end the abuse of animals in the circus, the fur industry, puppy mills, and the horse-drawn carriage industry, Olivia Munn proves there's no "hot list" or animal rights issue that she can't conquer.

Photo: (c) Andrew Southam for WelssArtists|Styling: Estee Stanley for Starworks Artists|Hair: John D for Starworks Artists|Makeup: Kayleen McAdams for The Wall Group|Manicure: Carla Kay for Cloutier Remix

14. Lea Michele: Lovely Lea Michele is a triple threat: She sings, she acts, and she advocates for animals. From her vegetarian diet to her refusal to wear fur to her rescued animals to her campaign to get horse-drawn carriages out of New York, Lea always hits a beautiful note for animals.

(c) Jim Jordan

16. Charlize Theron: She might be playing the wicked queen in Snow White and the Huntsman, but Charlize Theron is a noble defender of animals killed for fur and those in animal shelters waiting for homes.  

Photo: Don Flood

29. Eva Mendes: She would rather go naked than wear fur, and whether it's for Maxim or PETA, Eva Mendes always shows that everyone looks better in their own skin.

Photo: Robert Sebree  Hair: Davy Newkirk for Tracey Mattingly  Makeup: Jennifer Pitt for Tracey Mattingly  Wardrobe: Britt Bardo for Magnet  Wing design: Mia Gyzander Costumes

35. Yvonne Strahovski: If she looks angelic in the Maxim.com gallery, it's because Yvonne Strahovski is an angel for animals. She and her rescued pups are doing their part to end the animal overpopulation crisis. 

Maxim's Hot 100 is so full of compassionate cuties that we don't have room to do them all justice here, but check out the list for yourself to see sexy and sweet gals Mila Kunis, Emma Stone, Olivia Wilde, Kellie Pickler, Kristen Bell, JWoww, Miley Cyrus, Sarah Hyland, Emmy Rossum, Ashley Greene, Lake Bell, Miranda Kerr, Selena Gomez, Anne Hathaway, and Kristen Stewart. 

Rihanna got busted by the fashion police for wearing a dress made of crocodile. Kelly Osbourne rocked for crocs by proclaiming that she's not down with people wearing crocodile skins. 

Over on one of our other favorite shows, Ellen, Carrie Underwood dished about how her hubby, hockey player Mike Fisher, is getting cozy with vegan cuisine. And since Ellen DeGeneres gave Underwood Vegan Cooking for Carnivores by her chef, Roberto Martin, we're betting things will really be heating up in the couple's kitchen.

Ellen, Portia de Rossi, and Roberto also veganized the Rachael Ray Show. While Roberto and Portia cooked, Ellen quipped that cheese is so heavy that if you skip it, "there is more room for cocktails!"

In the Philippines for a performance, outspoken vegetarian Morrissey (a few chords from Meat Is Murder, anyone?), urged  President Benigno Aquino III to send Manila Zoo's lone elephant, Mali, who has spent the last 35 years imprisoned, to a sanctuary that PETA has secured for her in the U.S.

Captivating actor Marion Cotillard is also against holding animals captive. On the orca training scenes that appear in her upcoming film, Rust and Bone, she said, "I've always had a repulsion going in a place where animals are in captivity."

Of course, celebrities were also tweeting for animals this week, including Jonah Hill and Mike "The Situation" Sorrentino: 

To keep up with what the stars are doing for animals, follow @PETA on Twitter.