What's better than T-shirt time? "No T-shirt" time! And that's exactly what the throng of Jersey Shore fans got outside MTV's Times Square studios when Mike "The Situation" Sorrentino revealed his new PETA ad encouraging everyone to spay and neuter their animals.

Fans who couldn't make the unveiling still got to see Sitch's sweet tweet that revealed his ad and gave some love to PETA. And he wasn't the only one turning Twitter into an animal love-fest this week. Check out what these other celebs were doing to help with PETA campaigns:

Morrissey sings about how "Meat Is Murder," so, of course, he doesn't want any dead bodies around him when he's performing. For his appearance on The Colbert Report, Morrissey insisted that the entire building be meat-free for the day. And when, in true Colbert fashion, Stephen tried to rib Moz about his morals, the PETA pal had some zingers of his own ready. "Animals are nicer than humans," he deadpanned. "If you stick your grandmother in an oven, she will probably be tasty. But is that any reason to eat your grandmother?"

James Cameron might be about to make a titanic impact on the way the world eats. The director and newly minted vegan is challenging environmentalists to adopt a plant-based diet to save the planet. During a recent speech, he told the audience, "I want to challenge everybody here: If you're an environmentalist, I say, my challenge is, you can't be an environmentalist, you can't be an ocean steward, without truly walking the walk, and you can't walk the walk in the world of the future, the world ahead of us, the world of our children, not eating a plant-based diet."

And vegan Emily Deschanel is speaking up once again. Her show, Bones, dedicated another episode to animal rights, this time, to the cruelty of keeping exotic animals as "pets."

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

Leona Lewis and James Cameron are the latest compassionate celebrities to embrace vegan eating. Not surprising on either count, since James, who won a PETA Proggy Award for the animal-friendly film Avatar, said he planned to grow crops on his 2,500-acre rural New Zealand property, and Leona, a Sexiest Vegetarian alum, won't wear animal skins and unceasingly advocates for animal rights. Of the choice to eat vegan, James said, "It's not a requirement to eat animals, we just choose to do it, so it becomes a moral choice and one that is having a huge impact on the planet, using up resources and destroying the biosphere."

A very eloquent case for vegan eating, indeed.

© StarMaxInc.com

Adoption advocate Lance Bass spoke about his healthy eating convictions as well, saying of veganism that he is "getting close." He said the work he has been doing planting gardens with schoolchildren has inspired him: "I was eating way too much more protein and not enough veggies, and now I've completely changed that in my diet. … It's amazing, and I feel so much better, completely much better."

PETA UK's disturbing new undercover footage of foie gras farms is enough to make anyone go vegan. Celebrities were fired up on Twitter about British retailer Fortnum & Mason's cruel sale of foie gras and about other animal issues:

While these celebs rocked Twitter, another animal advocate was getting a rocking honor: Joan Jett and the Blackhearts were nominated for induction into the Rock and Roll Hall of Fame, and for the first time, voting is open to the public. Cast your vote for Joan, who never misses an opportunity to raise her powerful voice against cruelty to animals.

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

There isn't a chick alive who doesn't love Ryan Gosling, from the ones he woos in theaters (guilty) to the ones he helps on factory farms. He was spotted saving the latter recently by eating vegan at Los Angeles' Flore Vegan Cuisine.

Since animals aren't normally allowed to go to concert venues, Jay Sean invited them into his living room. The rapper performed an online Stageit show from his home and donated all the proceeds to PETA's "Angels for Animals" program, which provides neglected, chained dogs with doghouses, toys, and lightweight tie-outs.

On a slightly larger screen, Bones is set to air another animal rights–themed show. Vegan star Emily Deschanel says she loves hearing from fans that the Bones episode on chicken farming made them stop eating chickens, and now the Fox thriller is tackling the exotic-animal smuggling trade. 

Fran Drescher is hopping on the vegan train as well, telling RadarOnline about some of her delicious recipes: "Lately, I have been eating vegan and gluten-free, so I have been making delicious kale soup and gluten-free pasta with sautéed arugula, garlic, olive oil and pesto. I also like my recipe for white bean hummus, as well as a good simple field and micro green salad with my special house dressing of olive oil, lemon, Dijon mustard and salt and pepper. I like to add raw veggies to it, like peas, corn, carrots, and zucchini."

James Cameron is growing vegan. The director just purchased 2,500 acres of rural land in New Zealand, and part of his property includes a former dairy farm. The government is requiring Cameron to continue to farm on part of the land, and the director, who grabbed a PETA Proggy Award for Avatar, said that since he and his family are striving for a more plant-based diet, they will likely grow crops. 

Cameron is no stranger to awards, and neither is our friend Kate del Castillo, who snapped up several of Telemundo's nominations for its inaugural Premios Tu Mundo Awards.

Set design: Jack Guy|Hair and makeup: Eric Ferrell for Dion Peronneau Agency|Styling: Shiffy for Aim Artists

Other celebs were busy representing animals in the Twitterverse this week:

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

awn / CC

1/26 Update: You can call me soothsayer. Avatar has sunk Titanic and is now the highest-grossing movie of all time!

Confession: While I was watching Avatar, I found myself mumbling, "I want to go to there," as I grabbed at the three-dimensional floating mountains in front of me. But the best films are those that entertain while also sparking important conversations, and Avatar is certainly one of those films. Through a mastery of CGI and an unparalleled script, Cameron beautifully shows that all nature is interconnected and that all beings—no matter their species or race—deserve to be treated with kindness, respect, and dignity.

For making a film with an overarching message of decency, understanding, and compassion—as well as breathtakingly beautiful CGI that heralds a new era in filmmaking (one that we hope marks the coming end of the use of live animals in entertainment)—we have awarded James Cameron our 2010 Proggy Award for Outstanding Feature Film.

Avatar has already become the second-highest-grossing film of all time worldwide (the number one blockbuster of all time is Titanic), truly making Cameron the "King of the World." My prediction: Cameron will beat his own global box-office record with Avatar (and pick up an Oscar or 10 on the way) long before I'm done learning to speak Na'vi.

Written by Logan Scherer