How does Mad Men star Jessica Paré (aka "Megan Draper") keep her svelte figure? A vegetarian diet. Jessica told People magazine, "It's amazing what your diet can do for your skin." And Vincent Kartheiser isn't really a bad boy—he just plays one on TV. In real life, Vincent eats cruelty-free, too.

Los Angeles chef Roy Choi gained fame for his Kogi BBQ food truck, but he has turned his back on meat, earning him props from animal advocates and a slew of goodies from PETA.

And Scarlett Johansson credits vegan foods with helping her get ready for that Avengers bodysuit.

When vegan powerhouses collide: Catch the conversation that everyone's favorite vegan former POTUS, Bill Clinton, had with Ellen DeGeneres and prepare to swell with vegan pride.

Disturbed at how Ukraine is cruelly killing stray animals before the Euro 2012 football championship, the always gorgeous vegetarian beauty Pamela Anderson wrote to the president of the Union of European Football Associations imploring him to support spaying and neutering as a way to control animal overpopulation. Then, while she was in Mumbai, Pam was so stricken by the plight of the many homeless dogs roaming India's streets that she adopted one to join her family of rescued dogs.

Never one to miss an opportunity to speak up for animals, Pam joined other celebrities in tweeting for them this week:

Diane Keaton found an opportunity to promote animal adoption during an appearance on The Tonight Show. The witty star of the new film Darling Companion and longtime vegetarian introduced the audience to Clover, a dog up for adoption, and said, "Clover looks like Jay … except without the chin."

The crooning voice of Enrique Iglesias was music to one dog's ears. The sultry singer expanded his dog family to three, with a rescued German shepherd.

And country songbirds Kellie Pickler and Laura Bell Bundy both chose animal-friendly professions for their appearances on Great American Country's Day Jobs. Sexiest Vegetarian alum Kellie worked at a sanctuary with elephants rescued from circuses and zoos, and PETA pal Laura prepped a homeless dog from Emmylou Harris' animal shelter, Bonaparte's Retreat, for her big "audition" for a potential adoptive family.

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

Just in time for the first summer heat waves, Laura Bell Bundy and her adopted dog, Norma Jean, are starring in a new PETA ad and PSA, warning people about the danger of leaving their dogs alone in a car in warm weather.

In an exclusive interview with PETA, the multitalented country singer, TV and Broadway star, and "Cooter County" denizen talked about why she feels that getting the word out about this issue is so important. "[P]eople need to know about it," she explained. "They leave their dog alone in the car unintentionally thinking it's OK if they go inside the grocery store for five minutes, but … it's a hot car, and you wouldn't want to be left alone in there, either."
 

Laura Bell Bundy unveils her new PETA "Keep Your Dog Cool" PSA

 
Even on a mild day, the temperature inside a car parked in the shade can top 100 degrees in a few minutes. A dog left inside is at risk for heatstroke, which can cause brain damage or even death in just 15 minutes.

If you see a dog left alone in a hot car, please contact your local animal control or police department immediately, and do not leave until help arrives. PETA has "hot dog" leaflets available that can be placed on cars to remind people that dogs and hot cars shouldn't mix.

 
Written by Michelle Sherrow

Country music sensation Laura Bell Bundy braved the Nashville heat today to record PETA's latest "Hot Dog" TV spot. The public service announcement won't be released until next summer, but for now, you can check out the photos that we grabbed of Laura at the shoot.

Written by Shawna Flavell