Gerard Butler used to bare butt on movie set

London, March 16 : Actress Jennifer Aniston has revealed that her Scottish co-star Gerard Butler used to flash his butt on the sets of their new movie "The Bounty Hunter".

Aniston said the actor was a practical joker while shooting the movie and used to amuse the crew by baring his behind, reports accesshollywood.com.

Speaking in an interview with Gerard, she said: "You would moon the crew walking by the wardrobe trailer. That's how close our family got," said Aniston.

Added Butler: "Well, I like to moon."