Star slime fest is back! Justin Timberlake hosts this year's Nickelodeon's Kids' Choice Awards 20th Anniversary celebration, airing live March 31, from UCLA's Pauley Pavilion in Los Angeles. Kids will be able to vote in advance in a total of 16 categories. Surprise awards also will be announced during the show.

Voting begins online March 5 on Nick.com. Kids also will be able to vote via their cell phones. Beginning Sunday, March 11, in TEENick with the Kids' Choice Awards nominee a different category will be featured on-air each week, and kids can then cast their vote online at Nick.com.

The nominees for Nickelodeon's 20th Annual Kids' Choice Awards are:

Favorite Movie

Big Momma's House 2
Click
The Night at the Museum
The Pirates of the Caribbean: Dead Man's Chest

Favorite Male Movie Star

Jack Black
Johnny Depp
Adam Sandler
Will Smith

Favorite Animated Movie

Cars
Happy Feet
Ice Age: The Meltdown
Over the Hedge

Favorite Female Movie Star

Halle Berry
Dakota Fanning
Keira Knightly
Sarah Jessica Parker

Favorite Voice from an Animated Movie

Ashton Kutcher/Open Season
Queen Latifah/Ice Age: The Meltdown
Julia Roberts/The Ant Bully
Bruce Willis/Over the Hedge

Favorite Song

Bad Day (Daniel Powter)
Crazy (Gnarls Barkley)
Hips Don't Lie (Shakira, feat. Wyclef Jean)
Irreplaceable (Beyonce)

Favorite Male Singer

Chris Brown
Jesse McCartney
Sean Paul
Justin Timberlake

Favorite Music Group

Black Eyed Peas
Fall Out Boy
Nickelback
Red Hot Chili Peppers

Favorite Female Singer

Christina Aguilera
Beyonce
Ciara
Jessica Simpson

Favorite TV Show

American Idol
Drake & Josh
Fear Factor
The Suite Life of Zack and Cody

Favorite Television Actress

Miley Cyrus/Hannah Montana
Emma Roberts/Unfabulous
Jamie Lynn Spears/Zoey 101
Raven-Symone/That's So Raven

Favorite Television Actor

Drake Bell/Drake & Josh
Jason Lee/My Name is Earl
Charlie Sheen/Two and a Half Men
Cole Sprouse/The Suite Life of Zack and Cody

Favorite Cartoon

The Fairly OddParents
Jimmy Neutron
The Simpsons
SpongeBob SquarePants

Favorite Athlete

LeBron James
Shaquille O'Neal
Alex Rodriguez
Tiger Woods

Favorite Video Game

Madden NFL 07
Mario Kart
New Super Mario Bros.
SpongeBob SquarePants: Creature from the Krusty Krab

Favorite Book

Harry Potter (series)
How to Eat Fried Worms
Island of the Blue Dolphins
A Series of Unfortunate Events (series)