Will Smith, 98 Degrees, and LFO are amongst the celebrities that have just been added to the line-up for the 13th Annual Kids' Choice Awards, set to air on Nickelodeon on April 15.

Others slated to appear at the Kids' Choice Awards include Robert DeNiro, Mel Gibson, Bill Goldberg, Jamie Foxx, and Melissa Joan Hart. Rosie O'Donnell will serve as emcee for the awards show, which will be co-hosted by Frankie Muniz, David Arquette, L.L. Cool J and Mandy Moore (see "Mandy Moore Woos Dancer For New Video, Preps 'New' LP").

The Kids' Choice Awards will honor winners in 21 categories in four specific areas: TV, Music, Sports and Movies, and four other miscellaneous awards, and Will Smith is tied with "Austin Powers: The Spy Who Shagged Me" and "Toy Story 2" for the most nominations.

Smith is up for Kids' Choice Awards for his singing and acting in the "Wild Wild West" film and soundtrack, as he has been nominated for Favorite Movie Actor and Favorite Male Singer, while his "Wild Wild West" collaboration with Dru Hill and Kool Moe Dee is nominated for both Favorite Song as well as Favorite Song From A Movie.

Nickelodeon's 13th Annual Kids Choice Awards will be staged at the Hollywood Bowl in Los Angeles, and will be broadcast on April 15 at 8:00 p.m. (ET/PT)