Stars to get slimed at Saturday's Kids' Choice Awards

Will Smith, host of The 2012 Kids' Choice Awards

(CBS News) Get ready to watch some of your favorite celebrities get slimed.  Saturday's Kids' Choice Awards is shaping up to be star-studded affair.

Will Smith will host the 25th annual event, which will feature performances by British "it" boy band One Direction and Katy Perry.

Also expected to appear at the show are Nicki Minaj, Robert Downey Jr., Chris Rock, Emma Stone, Andrew Garfield, Zac Efron, Heidi Klum, Victoria Justice, Miranda Cosgrove, Big Time Rush, Chris Colfer and Cee Lo Green.

According to E! News, Taylor Lautner, Josh Hutcherson, Justin Bieber and Selena Gomez will also attend

First lady Michelle Obama will recognize Taylor Swift for her philanthropic efforts, presenting the country singer with the big help award. The first lady was the 2010 winner of the honor.

The annual event recognizes kids' favorites, spanning the worlds of film, music, TV and sports.

The "Harry Potter" franchise scored top nods with four nominations for favorite movie, favorite book, Daniel Radcliffe for favorite movie actor and Emma Watson for favorite movie actress.

"The Smurfs" has three nominations, including favorite movie, Sofia Vergara for favorite movie actress and Katy Perry for favorite voice in an animated movie. The "Kung Fu Panda" film is up for favorite movie, favorite cartoon and Jack Black for favorite voice in an animated movie.

This year's dual nods include "The Muppets" for favorite movie and Amy Adams for favorite movie actress. The "Twilight" franchise is in the running for favorite book, and "Twilight" star Kristen Stewart is up for favorite movie actress. She's also expected to attend the event.

LMFAO, Katy Perry and Taylor Swift are among the nominees in the music categories.

The Kids' Choice Awards air live from Los Angeles on Saturday at 8 p.m. ET on Nickelodeon.

See the full nominee list here.