07/28/2010 11:55 am ET | Updated May 25, 2011

Shaq Sings To Justin Bieber (VIDEO)

Shaquille O'Neal hasn't signed with a team yet in the offseason. However, season two of his reality show "Shaq Vs." starts on August 3 and he will be going up against Justin Bieber. During a concert rehearsal in Phoenix, Shaq showed up and joined Bieber for a duet. Scroll down to watch the video.

WATCH: (via FanHouse)