The 21st Annual Nickelodeon Kids' Choice Awards was held on March 29, 2008, at the Pauley Pavilion, Los Angeles, California. The show was the first live-action/animated Kids Choice Awards show. The event was hosted by Jack Black. Voting began March 3 on Nick.com and Nicktropolis. A "Bring on the Nominees" special hosted by Lil' JJ aired also. The Naked Brothers Band and Miley Cyrus were musical performances for the show. A sweepstakes was announced to promote the show. The number of votes cast broke the record previously set in 2007. 86,708,020 kids cast 88,254,272 votes (since kids were allowed to vote multiple times) between March 3–29 in 18 categories, to honor and vote for their favorites. Votes were cast via Nick.com, Nicktropolis, TurboNick, and for the first time via Nick's new mobile website (wap.nick.com). The award show attracted 7.7 million viewers. The 2008 Kids' Choice Awards is notable for being the only time that SpongeBob SquarePants did not win the Kids' Choice Award for Favorite Cartoon since the show was first nominated in 2003, with Avatar: The Last Airbender winning instead.

Presenters and Performers, and Stunts for KCA 2008

Presenters (in order of appearance)

Performers (in order of appearance)

Slimed Celebrities

Slime Stunts (in order of appearance)

Nicktoon appearance

Winners and nominees

Winners are listed first, in bold. Other nominees are in alphabetical order.

Movies

Television

Music

Sports

Miscellaneous

Wannabe Award

The Rocktopus

The Rocktopus is an eight legged octopus of rock n' roll who haunts Jack Black in his dreams. Later during the awards show, they settle their differences in time for the Rocktopus to activate the slimer machine.

iCarly: Live From Hollywood

The iCarly cast was live outside the Pauley Pavilion in Hollywood, where the 2008 Kids' Choice Awards were held. The cast aired from 9/8c - 11/10c. Carly, Sam, Freddie, and Spencer were at the Kids' Choice Awards because Spencer was hired to make a Kids' Choice Awards Blimp out of Wieners. Although Spencer was working on his sculpture, he happened to peek around the show, like the Gift bags for the Celebrities, going into Jack Black's Dressing Room, and stealing some mini wienies from the Snack table. In the end, his sculpture was destroyed when the Snack lady attacked him. People actually believed that it was a fan who destroyed the sculpture as security tackled the Snack Lady.

Musical Guests

Countdown to Kids' Choice: The Show: