Selena Gomez & the Scene performs "Who Says."

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

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

Jacob Latimore performs "Like 'Em All".

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

Justin Bieber performs "Mistletoe".

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

Greyson Chance performs "Waiting Outside the Lines."

Cole and Dylan Sprouse participate in several sketches.

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

Cody Simpson performs "All Day."

Hot Chelle Rae Performs "Tonight Tonight".

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

Colbie Caillat performs "Brighter Than the Sun".

Destinee & Paris performs "True Love".

Miss Piggy guest stars and participates in several sketches.

The Ready Set performs "Young Forever".

Kicking Daisies performs "Keeping Secrets".

The New Boyz performs "Meet My Mom".

Shane Harper performs "One Step Closer".

Andy Grammer performs "Keep Your Head Up".

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.

Iyaz performs "Pretty Girls" featuring Mann.