Jason Segel front and center

Judging by reactions at the SXSW world premiere of "Forgetting Sarah Marshall," the new Judd Apatow-produced heartbreak comedy, the film's star is certainly not the person listed on its marquee. That is, protagonist, Jason Segel (of "Freaks and Geeks" and "Undeclared" fame).

The real star of the movie is what a Harlequin romance novel might refer to as Segel's "manhood."

"Sarah Marshall" showcases the comedian in his full frontal glory -- four times, he is shown completely naked, to be exact. And here at SXSW, every time Segel was presented unsheathed, he nearly brought the house down with laughter.

Contrary to conventional comedy wisdom, Segel is nude and sobbing in three of the four naked moments after getting dumped by his girlfriend of five years (Kristen Bell as the titular Sarah).

The guy's clearly comfortable with his body, even though his absence of gym-toned abs brings to mind what Vince Vaughn probably looks like au naturel after a weekend of binge drinking.

Encountered at a jam-packed party for Facebook, one of the film's supporting cast, the British comedian Russell Brand (who plays the English rock star whom Sarah cuckolds Segel's character for), admitted certain regrets about the film's beefcake quotient. "If I had known there was going to be so much male [genitalia]," the flamboyantly bouffanted Brand said, "I probably never would have agreed to be in it."

-- Chris Lee