Actor Leonardo DiCaprio is on a mission to drop those pounds and he's on it fast. The "Catch Me If You Can" star is not exactly getting into shape per say, but is trying to get really skinny for his latest role in a movie called Inception. The movie has been written by Dark Knight director, Christopher Nolan.

A set insider tells RadarOnline.com, "There's an action scene coming up at the end of the year in which he needs to appear emaciated."

"Leo isn't the kind of guy who can just lose a radical amount of weight... He's following a strict diet and is embarking on a rigorous workout regime. Leo's a pretty determined kind of guy, when he sets his mind to things he always achieves them. Though this is going to be hard for him, you can guarantee he'll succeed."