It's hard to imagine cute Sarah Michelle Gellar looking like a prostitute, but once she looked the part, she was ready to act the part and be transformed into a woman on the streets.

The former "Buffy the Vampire Slayer" star plays a working girl in the new movie "Southland Tales" alongside Justin Timberlake and former wrestler The Rock.

Gellar, 29, insists her sexy blonde look made her ideal for the role.

She told Glamour magazine, "When you look at me, you think, 'I know - porn star!' It's sort of like a calling."

Gellar attracted a legion of male fans playing Buffy, and sent pulses racing with her tight costumes. However, the actress refused to bare her breasts in "Southland Tales," despite her illicit role.

She revealed, "My trainer said to me, 'So we've got to start getting you in shape for this topless scene.' And I was like, 'I'm sorry, what?' And he said he had read somewhere that I had said I really wanted to take my top off in a movie. But I immediately said to him, 'To know me is to know that's not true.'"

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