Kristen Stewart was the big winner at the 26th annual Nickelodeon Kids' Choice Awards held at the University of Southern California's Galen Center in Los Angeles.

The 22-year-old actress won in the favourite movie actress category (The Twilight Saga: Breaking Dawn - Part 2), beating strong contenders including The Hunger Games' Jennifer Lawrence, Journey 2: The Mysterious Island's Vanessa Hudgens, and The Avengers' Scarlett Johansson. She also won the female butt-kicker (Snow White and the Huntsman) award.

"Dude, I was too much of a coward to accept this," she said after receiving the award.

Stewart, who looked stunning in a blue Osman dress, got covered in the green slime after she hugged presenters Sandra Bullock and Neil Patrick Harris, who were slimed before presenting the award.

Christina Aguilera and Pitbull gave a power-packed performance with their duet Feel This Moment. There was a surprise for the rapper at the end of the performance, as the 32-year-old singer hit a button, covering Pitbull and the dancers in green slime.

Kids' Choice Awards 2013: THE WINNERS
Favourite TV Show: Victorious
Favourite Reality Show: Wipeout
Favourite Cartoon: SpongeBob SquarePants
Favourite TV Actor: Ross Lynch (Austin & Ally)
Favourite TV Actress: Selena Gomez (Wizards of Waverly Place)
Favourite Male Athlete: LeBron James
Favourite Female Athlete: Danica Patrick
Favourite Book: The Hunger Games series
Favourite Video Game: Just Dance 4
Favourite App: Temple Run
Favourite Movie: The Hunger Games
Favourite Movie Actor: Johnny Depp (Dark Shadows)
Favourite Animated Movie: Wreck-It Ralph
Favourite Voice from an Animated Movie: Adam Sandler (Hotel Transylvania)
Favourite Male Buttkicker: Dwayne Johnson Journey 2: The Mysterious Island)
Favourite Villain: Simon Cowell (The X Factor)
Favourite Music Group: One Direction
Favourite Male Singer: Justin Bieber
Favourite Female Singer: Katy Perry
Favourite Song: What Makes You Beautiful (One Direction)