Justin Bieber offers a vocal assist on Tyga's 'Wait a Minute,' but it feels like it's actually the Biebs' song and video, since he factors prominently in the action. This is hardly a cameo.

That's good news for Tyga, since he benefits from the dedication of Beliebers!

In the semi-futuristic clip, The Biebs dances and gets busy with a blond hottie, while Tyga does the same with a dark-haired babe.

They hold hands with their girls and run through a maze. But what are they running from? The paps? Beliebers? Crazed fans?

Watch and find out.