Jennifer Aniston plays a "sexually aggressive" woman in upcoming movie 'Horrible Bosses'.
According to her co-star Charlie Day, Jennifer's character Dr Julia Harris is a blackmailer who tries to get his character Dale Arbus to sleep with her.
He said: "Jennifer Aniston is sexually aggressive towards me and demands I sleep with her or she's going to blackmail me into making my fiancé think I'm sleeping with her.
"She has an elaborate way of doing that. I don't want the anxiety attack that I know I will have if I'm a scoundrel going into the wedding, so I avoid that."
He also jokes the pair had little time to get to know each other and found themselves naked quickly into the shoot.
He said: "We were thrust into getting to know each other pretty quickly. We get naked in a dental office."
However, he also admits he knew nothing about the 41 year old, a fact at which she was surprised.
He told website PopEater: "I didn't even know she was married to Brad Pitt. She couldn't believe that I didn't know. But I had no idea, for real. And I frankly don't care."
'Horrible Bosses' - which also stars Colin Farrell and Kevin Spacey - is due for release in July 2011.