Party For "Sarah Marshall"

Jason Segal, Kristen Bell and Russell Brand in a scene from the much-hyped "Forgetting Sarah Marshall," which opens April 18 across the U.S. Some of the movie's stars and their colleagues gathered April 10 to give the film a gala Hollywood premiere.

Actress Kristen Bell poses on the press line at the premiere of "Forgetting Sarah Marshall" in Los Angeles on Thursday, April 10, 2008. She plays the title character, a TV star vacationing in Hawaii with her new boyfriend when she runs into her old boyfriend.

Jason Segel poses with a model as he arrives at the Hawaiian-themed world premiere of "Forgetting Sarah Marshall" held at Grauman's Chinese Theatre on April 10, 2008, in Hollywood, Calif. Segel wrote and stars in the bawdy comedy, which is gaining buzz primarily for Segel's nude breakup scene at the movie's start.

Actress Cobie Smulders poses on the press line at the premiere of "Forgetting Sarah Marshall" in Los Angeles on Thursday, April 10, 2008. She co-stars with "Sarah Marshall" star Jason Segel on the TV sitcom, "How I Met Your Mother."

Actress Alyson Hannigan poses on the press line at the premiere of the Judd Apatow-produced "Forgetting Sarah Marshall" in Los Angeles on Thursday, April 10, 2008. Hannigan plays the wife of "Sarah Marshall" star Jason Segel on "How I Met Your Mother."

Actress Kristen Bell poses on the press line at the premiere of her new movie "Forgetting Sarah Marshall" in Los Angeles on Thursday, April 10, 2008. Bell is best known for her TV roles on "Veronica Mars," "Heroes" and "Gossip Girl."

Actress Mila Kunis poses on the press line at the premiere of "Forgetting Sarah Marshall" in Los Angeles on Thursday, April 10, 2008. She has a role in the movie which also stars Paul Rudd, Jonah Hill, Jason Bateman and William Baldwin.

Actress Leslie Mann poses on the press line at the premiere of "Forgetting Sarah Marshall" in Los Angeles on Thursday, April 10, 2008. Mann is married to the movie's producer, Judd Apatow of "Superbad," "Knocked Up" and "The 40 Year Old Virgin" fame. Apatow was named the Smartest Person in Hollywood by EW magazine last year.

Jason Segel is shown in a scene from "Forgetting Sarah Marshall."

A production poster for the movie "Forgetting Sarah Marshall." The publicity blitz for the movie has been almost unprecedented, with posters on billboards and buses in most major cities for several weeks now. There is also a web component with a blog and YouTube videos for Segel's character, Peter Bretter.

"Forgetting Sarah Marshall" co-stars Jason Segel and Kristen Bell promote the movie opn MTV's "Total Request Live" at MTV Studio's in Times Square April 15, 2008, in New York.

From left, Kristen Bell, Mila Kunis, Russell Brand, Bill Hader and Jason Segel make an appearance at MTV Studio's in Times Square for MTV's "Total Request Live," show to promote their new movie "Forgetting Sarah Marshall," on Tuesday, April 15, 2008.

Actresses Kristen Bell, right, and Mila Kunis chat together at MTV Studio in Times Square for MTV's "Total Request Live," show to promote their new movie "Forgetting Sarah Marshall," on Tuesday, April 15, 2008, in New York.

Actor Russell Brand makes an appearance at MTV Studio's in Times Square for MTV's "Total Request Live," show to promote his new movie "Forgetting Sarah Marshall," on Tuesday, April 15, 2008, in New York.