Justin Bieber, LMFAO, Perry in Toronto for MMVAs

TORONTO - Shrieking teens, start your engines: Justin Bieber's performance at the MuchMusic Video Awards is just hours away.

The 18-year-old teen-pop star is just one performer expected at tonight's MMVAs, held as always outside of MuchMusic headquarters in downtown Toronto.

Bieber's performance is certainly timely - on Tuesday, he'll release his long-awaited third full-length, "Believe."

But he's not the only performer who inspired hundreds of people to line up at the crack of dawn for a shot at free passes to the annual outdoor bash.

The show will be hosted by LMFAO, the outrageous duo behind the ubiquitous madness of "Party Rock Anthem" and "Sexy and I Know It."

Other performers expected include pop bombshell Katy Perry, pop-rapper Flo Rida and "American Idol" winner Kelly Clarkson.