Entertainment Tonight ET Online ETOnline.com

Time magazine has revealed its 100 Most Influential People in the World and this year's list includes singers Rihanna and Adele, as well as The Help actresses Viola Davis and Jessica Chastain and comedians Stephen Colbert and Chelsea Handler.

The list -- which also includes political and sports figures "making an enduring impact around the globe" -- includes profiles of the honorees written by their celebrity admirers.

In the special Time issue hitting newsstands tomorrow, Stella McCartney sums up Rihanna like this: "She's one of the coolest, hottest, most talented, most liked, most listened to, most followed, most impressive artists at work today, but she does it in her own stride."

On British sensation Adele, fellow singer-songwriter Pink writes: "Go to Mars right now and I'm pretty sure if there is life on that planet, they're playing Adele. And for good reason." She adds: "I am so relieved that Adele possesses the kind of beauty that she does, that she's crass and funny and that she sings live -- and incredibly."

Bridesmaids producer Judd Apatow calls the film's star and Saturday Night Live cast member Kristen Wiig "fantastic -- vulnerable, explosive and hilarious." He adds: "For her, (Bridesmaids) was just about making a movie she could be proud of, and she labored over it tirelessly for half a decade. I guess coming fast out of the gate requires years of hard work that nobody but me gets to see. I am the lucky one."

Doonesbury cartoonist Garry Trudeau writes about The Colbert Report's Stephen Colbert: "Because of how his humor works, the audience finds meaning through sustained inference, which is a lot more fun than it sounds. Colbert's riffs are so ingeniously convoluted and deeply weird that the post-reason wingers have no response to him. They just have to absorb the punishment, night after night."

Comedian Kathy Griffin uses her trademark, uncensored wit to sum up her friend Chelsea Handler: "Look, I don't know how Chelsea Handler does it. She presides over her own media empire -- talk show, sitcom, books -- all while sharing a network with Ryan Seacrest and the Kardashians. To hell with the Time 100; she should be Person of the Year just for putting up with Khloe."

The magazine will celebrate its Top 100 issue with a star-studded gala and performance by Rihanna on April 24 at New York City's Frederick P. Rose Hall.