The movie star reveals he had to turn the offer down because of a scheduling conflict.

Franco tells MTV News, ""She actually asked me to be in that video, the one with the relationship that gets crazy. I couldn't do it.""

But the actor insists he would have been interested in the role under different circumstances, adding, ""I do like Rihanna.""

The R&B star eventually asked model Dudley O'Shaughnessy to play her love interest in the promo.