"Heroes"/"Veronica Mars" star KRISTEN BELL and "How I Met Your Mother" buddy JASON SEGEL take center stage in the bawdy comedy 'Forgetting Sarah Marshall,' and ET was at their big red-carpet premiere at the world-famous Grauman's Chinese Theatre in Hollywood!

Written by Segel and produced by 'The 40-Year-Old Virgin' and 'Knocked Up' mastermind JUDD APATOW, 'Forgetting Sarah Marshall' is the world's first "disaster comedy." The plot follows Segel's character's quest to get over his famous girlfriend after she dumps him for a rock star. Hoping to get over his heartache and forget the past, he heads to Hawaii for a vacation getaway -- only to bump into Sarah and her Brit rocker boyfriend. Still miserable, Segel finds a welcome distraction with a beautiful resort employee (MILA KUNIS) who just may help him forget Sarah Marshall -- that, and the help of several hundred tropical umbrella cocktail drinks.

Also starring Apatow regulars PAUL RUDD and JONAH HILL, 'Forgetting Sarah Marshall' hits theaters April 18.