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").

In honor of "Be An Angel" Day, an international, nondenominational celebration of acts of kindness, we thought we'd share some of our favorite ads starring celebrity angels for animals—including Kimora Lee Simmons, Audrina Patridge, and David Boreanaz—who have earned their wings by spreading heavenly messages about protecting dogs, cats, and other animals.

To be an angel for animals today, consider giving bedding and treats to a lonely chained dog, playing with cats at an animal shelter, driving a needy animal to a spay/neuter appointment, or just giving your best friends some extra TLC.

Find more tips on being an angel for your animal friends in PETA's Caring for Animal Companions Guide.

Written by Michelle Sherrow

Maxim just released its "Hot 100" list, and apparently the editors understand the appeal of kindness toward animals. The list isn't just a "who's who" in hotness—it's a "who's who" in compassion too.

televiciando / CC

Number one on Maxim's list is Olivia Wilde, who always gets House fans' pulses racing. While she plays a naughty doctor, she still knows how to play nice with animals. You guessed it, Maxim's number one is vegan!

Chan Marshall, aka Cat Power, gets her audiences purring with her sultry voice and gorgeous looks, but we're happy as a kitty in catnip over the fact that she helped us promote spaying and neutering.

How much hotness can one woman dish up? Eva Mendes is the answer! Need more proof? Check out her sexy "I'd Rather Go Naked Than Wear Fur" ad. Eh, what'd I tell ya?

Stunning Charlize Theron is as compassionate as she is talented—just ask her dog.

Audrina Patridge's sunny smile could light up Las Vegas—but it's her heart (which has a gigantic soft spot for animals) that we're interested in.

Millions idolize blonde beauty (and Sexiest Vegetarian contest winner) Carrie Underwood, and we can't say we blame them.

Tricia Helfer's luminous looks and love for animals are otherworldly.

The evidence is in: There's no trace of a doubt that Roselyn Sanchez's steamy anti-fur ad is muy bonita.

The reason we're happy that ravishing Joanna Krupa graces magazines all over the newsstand? She refuses to compromise her values and never wears fur.

Written by Karin Bennett

Spoiler alert: If you haven't watched the series finale of Battlestar Galactica, do not read any further. Simply look at the photos below, then leave a comment telling us which public service announcement is your fave, Tricia "Six" Helfer's or Jamie "Lee Adama" Bamber's.

So the greatest show in the history of the universe, Battlestar Galatica, has come to an end, and now I have no idea what the frak I'm going to do with my Friday nights. (Wait, did someone just whisper Dollhouse into my ear?)

I loved that an underlying theme of the series was mankind's failure to learn from our mistakes and that it was our worst traits that led directly to our unraveling again and again. That leads me to lovely Tricia Helfer's character, Six, and the character everyone loves to hate, Gaius. Isn't it ironic that a version of the Six Cylon and Gaius would end up being angels (naughty, naughty angels) who would start the cataclysmic events that would end humankind? I think someone here at PETA anticipated that Tricia's character would turn out to be an angel; after all, we did ask her to star in our first-ever "Angel for Animals" ad in behalf of felines long before the finale was in sight.

The finale, while amazing, left me with mixed feelings. I was so excited to watch it, but at the same time, I was sad that the show had come to an end. I admit that I expected more … um … well, more carnage. I was positive that all the humans were actually Cylons, and I was convinced that more of the prominent cast members would die. And I kept thinking that the Cylons had one last sinister plot up their sleeve. Or that they were going to blow up the Galactica and kill everyone. I'm so glad I was wrong!

I would have been devastated if they had killed off my favorite characters, like Helo (did someone mention Dollhouse again?) and Lee "Apollo" Adama (aka Jamie Bamber), who, by the way, looked amazing in the last few episodes (and is by far the cuter of the two Adama boys), but not as good, of course, as when he took it all off to speak up for bears who are killed for their fur in the super-hot "Bare Skin, Not Bear Skin" ad. Oh, Jamie. And I love that, like every episode before, they kept us guessing. Well done, BSG writers!

As pretty as Tricia's ad is, Jamie's is still my favorite. Sigh. Check out their ads below and then tell us which one is your favorite. The reader with the most convincing response will win a copy of the ad of their choice.

You can enter the contest by posting a comment before April 13, 2009. We'll contact the winner on April 14, 2009. By commenting, you are agreeing to the contest terms and conditions and our privacy policy.

Thanks for some awesome television, BSG. I miss you already.

Written by Patricia Trostle

P.S. I have to say that I think the high point of the finale for me was when Chief strangled Tory for shooting Cally out the airlock. I actually yelled out, "Yes! Finally!" It made my night.

I love the tagline for this new ad, which features Tricia Helfer—star of the hit Sci-Fi Channel show Battlestar Galactica. Tricia plays a ruthless cylon robot on BSG, but I know for a fact that she’s very different in real life. You wouldn’t, for instance, find a ruthless robot donating their time to pose with a kitty cat to encourage people to treat their animals humanely. Unless, like, they had some devious ulterior motives, like world domination. Which is definitely not the case with Tricia—she just really cares about animals. You can watch our interview with Tricia here, and enter to win seasons 1-3 of the show, along with the movie Razor on DVD.

The ad is absolutely stunning—that’s Tricia’s pal Mr. Nix on the left.