After its impressive box office record, it's only a matter of time before the sequel to The Hangover Part II is greenlit. The follow-up to the 2009 film The Hangover has grossed over $488 million to become the most globally successful R-rated comedy ever.

The Hangover Part II - which reunites original cast members Zach Galifianakis, Bradley Cooper, Ed Helms and Justin Bartha for the movie set in Bangkok - took in $21.4 million this weekend, surpassing the $468 million generated from the first movie and bringing the combined total to almost one billion dollars.

Following on from the box office success of The Hangover Part II, it is likely the cast and crew will return for a third film in the franchise with star Zach - who plays Alan Garner in the Todd Phillips-directed films - already getting calls about it. "They want to do a Hangover 3. I'm getting fricking phone calls already," Galifianakis said.

Filmmaker Todd has previously revealed another film in the series would be the last and thought it would be good to change the "template" of the franchise: "If we were to do a third one, and quite honestly we really haven't talked about it. I think we have a clear idea where that would head and it's certainly not in the same template you've seen these movies and obviously we always envisioned it as a trilogy as you can imagine, the third would very much a finale and an ending."