New York, NY -- "Spider-Man" actress Kirsten Dunst is flapping her lips about how she prepares for her kissing scenes -- She gets "grossed out" by her co-stars.

Dunst -- who has kissed hotties like Josh Hartnett, Brad Pitt and Tobey Maguire -- tells the latest "Seventeen" magazine that she didn't like some of her co-stars at all, and had to fake the on-screen chemistry.

Although she won't name names, she says sometimes when she kisses an actor, she thinks, "Yuck, I don't want to kiss you."

However, Dunst -- who turns 20 today (Apr. 30) -- is nothing, if not a trooper. She says that even when she's "grossed out" by an actor, she tries to turn her frustration "into passion."

Dunst won't say if she was grossed-out by Maguire while filming "Spider-Man" but she does say he's "adorable" and admits she had a "little crush on him," before they met.

"Spider-Man" opens nationally this Friday (May 3).

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