The Hollywood hunk played teacher Phil in 2009's The Hangover, and reprised the role again for this year's (11) follow-up, The Hangover Part II.
And Cooper has called on director/producer Todd Phillips to make a third and final movie - as he's convinced a trilogy will help wrap up the characters' adventures.
Asked by BBC Radio 1 presenter Fearne Cotton whether he's keen to do another movie in the series, he replies, ""Yes please, I hope so - can you write in? I'll do whatever Todd wants to do - he's the best, he's the greatest.
""I love Phil the character. I would do it in a heartbeat. There's gotta be a trilogy, you have to close it up. One more.""