Justin Bieber, left, and host Will Smith get slimed after Bieber accepts the award for favorite male singer onstage at Nickelodeon's 25th Annual Kids' Choice Awards.
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First lady Michelle Obama, left, presents the big help award to Taylor Swift onstage at Nickelodeon's 25th Annual Kids' Choice Awards.
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Victoria Justice, right, and Daniella Monet accept the award for favorite TV show for "Victorious" at Nickelodeon's 25th Annual Kids' Choice Awards.
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Justin Bieber, right, accepts the award for favorite male singer, presented by Jaden Smith, onstage at Nickelodeon's 25th Annual Kids' Choice Awards.
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Keke Palmer arrives at Nickelodeon's 25th Annual Kids' Choice Awards.
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Taylor Lautner accepts the award for favorite buttkicker onstage at Nickelodeon's 25th Annual Kids' Choice Awards.
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Katy Perry arrives at Nickelodeon's 25th Annual Kids' Choice Awards.
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Ariana Grande arrives at Nickelodeon's 25th Annual Kids' Choice Awards.
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From left, Sasha Obama, first lady Michelle Obama and Malia Obama attend Nickelodeon's 25th Annual Kids' Choice Awards.
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Fans of musical group Big Time Rush are seen in the audience at Nickelodeon's 25th Annual Kids' Choice Awards.
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Katy Perry performs at Nickelodeon's 25th Annual Kids' Choice Awards in Los Angeles.
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Isabella Castillo arrives at Nickelodeon's 25th Annual Kids' Choice Awards in Los Angeles.
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Ashley Tisdale arrives at Nickelodeon's 25th Annual Kids' Choice Awards in Los Angeles.
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Kelly Kelly arrives at Nickelodeon's 25th Annual Kids' Choice Awards in Los Angeles.
