Actor James Corden has risked the wrath of BRIT Awards bosses by unmasking Beyonce as the show's surprise performer just hours before the ceremony.

The funnyman, who is hosting the prizegiving in London on Wednesday night (19Feb14), leaked the organisers' biggest secret in a radio interview on the morning of the show.

Speaking to Britain's BBC Radio 2, Corden said, "There's this weird thing with this year's Brits where I've been - more than any other year - told things I can't say. But I figure it's the day... I must be able to tell you? Beyonce. Beyonce is performing tonight. She's performing a track she has never ever performed live before. Ever."

Beyonce's surprise appearance has reportedly been under wraps for weeks. Confirmed performers for the event include Lorde, who will collaborate with dance act Disclosure, Katy Perry, Pharrell Williams, who will reportedly play a medley with Nile Rodgers, and Arctic Monkeys.