Rihanna pranks Jimmy Kimmel in his bed: 'What the f--- is going on?'

If you thought you'd seen all the April Fool's pranks out there, think again.

Rihanna just pulled off one hell of a doozy by surprising US late-night TV host Jimmy Kimmel in his bedroom in the wee hours of the morning, singing her new single 'Bitch Better Have My Money'.

As he said later: "I will admit that's not how you usually come to me in my dreams."

Watch it play out above.

Catch up on Rihanna's hilarious party photos with Beyonce and pals this week at Jay Z's Tidal launch: