Carly Rae Jepsen and Cody Simpson are two of the special supporting acts for Justin Bieber's Believe tour, and they made their debut onstage on Saturday.

Carly wanted to sing her latest single "Good Time", but because Owl City - the guy who usually sings on the song - wasn't there, she asked Cody to sing Adam Young's part.

Want to see what "Good Time" sounds like with Cody instead? Check out the fun video below.