Ariana Grande surprised fans by reuniting with her Victorious co-star Liz Gillies to perform their hit duet “Give It Up” live in concert, bringing pure nostalgia and powerhouse vocals to the stage.

We're bringing you a 60-minute compilation of every performance ever on Victorious. Ariana Grande as Cat Valentine, Victoria Justice as Tori Vega, Liz Gillies as Jade West, and more! Talk about ICONIC. Here are all the performances from your faves on Vict...

From Disney's "Cheetah Girls" OGs Raven-Symone & Adrienne Bailon-Houghton to Nickelodeon stars Keke Palmer & Kenan Thompson, see your favorites compete on "Celebrity Game Face."