Kids Choice Awards

Katy Perry, Kristen Stewart and Selena Gomez attend Nickelodeon's 26th Annual Kids' Choice Awards on March 23, 2013 in Los Angeles, California.

Getty Images for KCA

Pitbull and Christina Aguilera kicked off the silly Kids' Choice Awards on Saturday with their song "Feel This Moment" and were joined by young backup dancers resembling the smooth-headed rapper and blonde diva. At the end of their performance, Aguilera smashed a button, covering Pitbull and the dancers in the show's signature green goo.

That was just the beginning of the celebrity sliming.

In one of his first acts as show host, "Transformers" star Josh Duhamel dumped the goop on Los Angeles Lakers player Dwight Howard.

"I guess that's what we call a slime dunk!" Duhamel said.

Sandra Bullock and Neil Patrick Harris caught a wave of the green stuff after a magic trick from the "How I Met Your Mother" co-star went awry.

Dwayne "The Rock" Johnson, who picked up the trophy for male butt-kicker, blasted a sumo-suited Nick Cannon and Duhamel with the goo. The first few rows of the audience were also doused.

Duhamel said a record-breaking 350 million votes had been cast for this year's viewer-voted ceremony, which honors kids' favorites in film, music, sports and TV.

Johnny Depp and Kristen Stewart avoided slime — mostly — while picking up their blimp-shaped trophies. The "Dark Shadows" star won as favorite movie actor at the 26th annual awards extravaganza, while the "Twilight" leading lady was selected as favorite movie actress and female butt-kicker.

"Dude, I was too much of a coward to accept this," she said embracing the slime slathered on the podium at the University of Southern California's Galen Center.

Other winners included One Direction as favorite music group and favorite song, Katy Perry as favorite female singer, Justin Bieber as favorite male singer,  Adam Sandler as favorite voice from an animated movie for "Hotel Transylvania," and "The Hunger Games" as favorite movie and book. Bieber's ex-girlfriend Selena Gomez won favorite TV actress for her show, "Wizards of Waverly Place."

"Always be nice to your parents," Sandler told the crowd of screaming kids while accepting his awards. "Always be nice to your teachers."

MUSIC Winners
Favorite Music Group: One Direction
Favorite Male Singer: Justin Bieber
Favorite Female Singer: Katy Perry
Favorite Song: "What Makes You Beautiful" -- One Direction

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