Jennifer Aniston’s new co-star has today revealed that Jen plays a “sexually aggressive” woman in their next flick, Horrible Bosses.

In contrast to her usual rom-com roles, Jen’s character Dr Julia Harris is a blackmailer who tries to get co-star Charlie Day’s character to sleep with her.

The actor said: “Jennifer Aniston is sexually aggressive towards me and demands I sleep with her or she’s going to blackmail me into making my fiancée think I’m sleeping with her. She has an elaborate way of doing that.” Charlie also joked that the duo had little time to get to know each other before finding themselves naked quickly into filming the flick, due for release in July 2011.