Justin Bieber: Watch his dance-off with Shaquille O'Neal

Justin Bieber may dance in front of millions of adoring fans, but Shaquille O'Neal has some of his own moves.

In the clip from "Shaq vs." Tuesday (Aug. 31), we see the pop star take on pro athlete in a freestyle dance-off.

"im sorry but everytime I watch this just makes me laugh. so epic," Biebs tweets about the match.

Neither of them are really polished, but it's pretty fun to watch.

Their real dance-off was set to take place on stage for one of Bieber's concerts. You can also catch the vocal "talents" of O'Neal, who says he did the whole thing to impress his kids. During the episode, he hangs with Biebs at a press conference, playing some b-ball and bowling.