Selena Gomez & the Scene performs "Who Says."

Coco Jones performs "Stand Up" and participates in a sketch.

Pia Toscano performs "This Time" and Leigh-Allyn Baker and Mia Talerico participate in a few sketches.

Jacob Latimore performs "Like 'Em All".

Far East Movement performs "Rocketeer", with special guest Miguel.

Greyson Chance performs "Waiting Outside the Lines."

Justin Bieber performs "Mistletoe".

China Anne McClain performs "Unstoppable" and participate in a few sketches.

Mitchel Musso performs "Get Away" and participates in a sketch.

Cole and Dylan Sprouse participate in several sketches.

Christina Grimmie performs "Advice".

Lemonade Mouth (Bridgit Mendler, Adam Hicks and Hayley Kiyoko) perform "Determinate" and Bridgit Mendler and Adam Hicks participates in a few sketches.

The Ready Set performs "Young Forever".

Destinee & Paris performs "True Love".

Cody Simpson performs "All Day."

Mindless Behavior performs "My Girl". The So Random! cast are trying to find Rufus.

Colbie Caillat performs "Brighter Than the Sun".

Hot Chelle Rae Performs "Tonight Tonight".

Miss Piggy guest stars and participates in several sketches.

Shane Harper performs "One Step Closer".

Andy Grammer performs "Keep Your Head Up".

Kicking Daisies performs "Keeping Secrets".

The New Boyz performs "Meet My Mom".

Tony Hawk guest stars and does a sketch on the show while the main cast of the show tries to make him do something extreme. He finally flies out at the end of the show.

Dave Days performs "What Does It Take".