We all knew this was coming eventually, but like the saying goes "All good things must come to an end." And for our favorite wolfpack, they plan on going out with a bang.

"The Hangover Part 3" premiered in Los Angeles Monday night. Stars Bradley Cooper, Ed Helms, Zach Galifianakis, Justin Bartha and Heather Graham gathered one final time to introduce the final installment of the comedy series.

Cooper told USA Today "it was a little sad" and summed up his feelings with one word, "bittersweet."

"Without sounding too corny, there's a lot of laughing going on set," Galifianakis said. "There's a lot of camaraderie. There's a lot of making fun of each other. I will miss that. I won't miss getting made fun of, but I love making fun of the other guys. We click."

Bartha described that "the story is different just because it's not about piecing together the night before, it's not a drugged hangover kind of thing. It's about Alan, Zach's character coming to terms with his life and also his friendship with Mr. Chow. So it's really about Alan. And also, it's really a wrap-up to the trilogy."

Graham, who was not featured in the second film, but reprises her role as Jade in the final film has a sweet spot for the movie's location.

"I feel like whenever I go to Vegas I just think of the film," she said. "They have a slot machine that has my picture on it."

"The Hangover Part 3" hits theaters Friday.