(Cover) - EN Showbiz - Bradley Cooper developed a special relationship with a monkey while making The Hangover sequel.

The Hollywood hunk who plays mischievous Phil Wenneck in the comedy franchise enjoyed being reunited with Crystal the monkey, after working with her on a previous project. Bradley says he formed a close bond with Crystal and he loved shooting scenes with her for The Hangover 2 because she gave such an impressive performance.

Crystal is great. She actually plays a he in the movie but you'd never know, he is quoted as saying. I worked with her before so this was our second time together which was pretty special.

Bradley also admits he was happier about working with Crystal the second time around. Crystal was given special diapers to wear when she was on the movie set, so it was far more pleasant experience for Bradley.

The first time she didn't have diapers on so sitting on my shoulder could be a problem but this time she had diapers so we had a great time," he added.

Bradley is joined in The Hangover 2 by the franchises original cast members Ed Helms and Zach Galifianakis. The sequel sees the group of friends travel to Thailand to celebrate Stus wedding. (C) Cover Media