Bradley Cooper 'worried about Hangover II'

Bradley Cooper has admitted that he is concerned about the box office potential for The Hangover Part II.

The sequel - opening in cinemas this May - follows on from 2009's comedy blockbuster, which grossed more than $450 million in ticket sales worldwide.

"As we inch closer to release, I'd be lying if I said I wasn't trepidatious," Cooper told the Los Angeles Times of the Thailand-set follow-up.

However, the Limitless star believes that Part II has the potential to top the first movie, adding: "The script was better than the first one. The scope is larger. [Shooting it] went smoother than it did the first time in terms of letting spontaneous moments happen. And Bangkok is like Vegas on steroids."

Ed Helms, Justin Bartha, Zach Galifianakis and Mike Tyson will return for The Hangover Part II, joined by new castmembers Liam Neeson, Paul Giamatti and Jamie Chung.

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