Hollywood star Jack Nicholson said on Friday he was proud of his ‘‘big fat ass’’ after baring his bottom in the film Something’s Gotta Give. Nicholson, 66, said he hoped the exposure of his hidden asset would help promote the film. ‘‘I’m very proud of my ass,’’ Nicholson said. ‘‘I suggested it for the poster for the movie, but I found out that would be illegal. I just have a big fat ass.’’ ‘‘It was a great pleasure to be naked in Nancy’s film,’’ said Keaton who plays the mother of Nicholson’s girlfriend. — (Reuters)