Canadian actor Michael Cera had to lie down after Rihanna slapped him during the shoot of their new flick 'This Is the End.'
Director of the flick, Seth Rogen, told Ryan Seacrest on his KIIS-FM radio show on Friday, that Rihanna gave the 25-year-old actor permission to smack her butt during a scene for their new movie, if she could slap him, Contactmusic reported.
He added that in his opinion it was one of the times that Rihanna got him in the ear and it wacked off his equilibrium.
