From Hollywood to Wimbledon, it's clear: Everybody's going vegan.

Mischa Barton said she dropped weight when she dropped animal products, and vegetarian Alan Cumming was inspired by vegan Mike Tyson to do all animals a solid and go vegan too.

Venus Williams' new vegan diet is helping her manage her Sjögren's syndrome. Little sis Serena Williams followed in Venus' tennis shoes and went vegan as well. And WWE champ CM Punk made it his New Year's resolution to C Meat out the door.

Photo: Robert Sebree • Makeup: Steven Sollitto

Roselyn Sanchez asked people not to light fireworks, which terrify animals and kill birds, on New Year's Eve. Then she started her year off with a bang, welcoming a new little animal advocate, daughter Sebella Rose Winter, to her family.

UFC Fighter Dan Hardy is welcoming fellow fighter Matt Hughes to the ring to pick on someone his own size. Hardy called Hughes out for hunting for sport, tweeting, "There is no justification for what he does. I fight against other people that enjoy fighting also. Shooting animals for fun isn't sport and it certainly isn't cool."

What is cool is keeping up with what  celebs are doing to help animals by following PETA on Twitter.

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