Jamie Chung replaces Heather Graham in `Hangover 2`

Los Angeles: `Premium Rush` actress Jamie Chung is stepping into the shoes of Heather Graham in `Hangover 2`.

The actress will play Ed Helms` new fiancée in the sequel. The actor had married Graham in the first movie during their drunken night in Las Vegas.

Director Todd Phillips has already begun shooting the movie, which is being produced by Warner Bros and Legendary Pictures.

Though the film reunites most of the stars from the original -- Bradley Cooper, Zach Galifianakis, Ed Helms and Justin Bartha -- Chung is one of the few new people to join the movie, which will see `Schindler`s List` star Niam Neeson playing a crazy tattoo artist.

The film revolves around the plot of a misbegotten trip to Thailand. Ken Jeong and Mike Tyson are also returning, the Hollywood Reporter said.

Chung is one of the stars of Warners` upcoming Zack Snyder fantasy `Sucker Punch`. She recently finished shooting `Premium Rush`, a thriller starring Joseph Gordon-Levitt.