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The countdown to the 25th Annual Kids' Choice Awards, hosted by Will Smith, has begun and Justin Bieber, Katy Perry, 'Harry Potter' and more are among the lucky nominees.

Honoring the best in film, music, TV and sports, stars like Selena Gomez, Tim Tebow, Kristen Stewart and Miranda Cosgrove have all earned nods this year.

Up for four awards is 'Harry Potter,' scoring nominations in the Favorite Movie, Favorite Book (the 'Harry Potter' series), Favorite Movie Actor (Daniel Radcliffe) and Favorite Movie Actress (Emma Watson) categories.

Meanwhile, 'The Smurfs' has landed three nods, including Favorite Movie, Favorite Movie Actress (Sofia Vergara) and Favorite Voice in an Animated Movie (Katy Perry). Katy will also face-off with LMFAO and Taylor Swift, all of whom have earned two noms, in the Favorite Song category.

The 2012 Kids' Choice Awards will air live from USC's Galen Center in Los Angeles on Saturday, March 31, at 8PM. Beginning on March 1, fans can cast their votes in 20 total categories via Nick.com, Nickelodeon's Facebook page or the Nickelodeon mobile app. Check out the full list of nominees here. Who will you be voting this year?
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