Will Smith will host Nickelodeon\'s 25th-annual Kids\' Choice Awards. Nickelodeon announced on Wednesday that 10-time winner Smith will host the March 31 ceremony from the Galen Center in Los Angeles. The show will air live on Nickelodeon. Smith calls the awards \"the year\'s liveliest, slimiest and most outrageous party for kids and teens.\" The actor recently finished filming Men in Black III. The Kids\' Choice Awards honor kids\' favorites in film, music, sports and television by tallying the votes of kids online and via mobile devices. During the show, green slime is routinely dumped on celebrities and winners receive trophies shaped like blimps.