"Kids' Choice is a fantastic mix of mega-stars and mega-mess, and our 20th anniversary show will be the biggest, loudest, messiest, star-filled spectacle in two decades," said executive vice president, development and original programming Marjorie Cohn. "This is the event where Hollywood celebrities come to play and this year if you want to be seen, you gotta go green because we'll be breaking the slime barrier."

Timberlake will set the stage for Nickelodeon's Kids' Choice traditions including the Wannabe Award, an honor bestowed on a celebrity role model who kids most "want to be." Past recipients (chronologically 2001-06) are: Tom Cruise, Janet Jackson, Will Smith, Adam Sandler, Queen Latifah and Chris Rock, adds the release.

Nickelodeon's Kids' Choice Awards has emerged as one of the biggest events in Hollywood, boasting a massive popular vote and sweeping audience participation. It is the only award show that gives kids the power to vote for their favorites in movies, television, music, sports and much more -- and honors their opinions with a live show filled with the stars they love.

Nickelodeon's 7th Annual Kids' Choice Awards was the first to air internationally in 1994 on Nickelodeon's channel in the UK and now, more than a decade later, the US show is seen in more than 205 million households across Nickelodeon's 34 channels in the UK, Europe, Russia, Israel, Asia, Australia, Latin America and Brazil. Since premiering the first KCAs in the US in 1987, Nickelodeon has launched eight fully localized versions around the globe.