The Hangover's bittersweet ending

The third and final chapter of "The Hangover" has its premiere.

The stars of the popular comedy franchise Bradley Cooper, Ed Helms and Zach Galifianakis hit the red carpet in Los Angeles to celebrate the film's opening.

For Copper the night was one of nostalgia and somewhat emotional as the actors looked back on what has been a very good run.

SOUNDBITE: Bradley Cooper, actor, saying (English):

"It was kind of bittersweet. We started at the press junket and we all sorted of were kind of shocked at how emotional it is at the ending of the road. It is nice that we kind of have a two-week tour to ritualistically say good-bye."

"The Hangover Part III" is the epic conclusion to an incomparable odyssey of mayhem and bad decisions, in which the guys must finish what they started by going back to where it all began: Las Vegas.

Actor Ken Jeong, who plays the despicable villain, "Mr. Chow," showed his serious side when asked how things are different.

SOUN