Kirsten Dunst is not a child star anymore and she doesn't  want her father watching her racy new flick, "Bachelorette."

"I can't do that to him," Dunst, 30, told E! Online at the Hollywood premiere of the film. "I didn't even tell him there was an L.A. premiere. And I was like, 'Yeah, dad-don't even try getting it on iTunes because you will not like this movie. You're a prude. You will hate it. I know you!'"

The flick - now available on Video on Demand and in theatres on Sept. 7 - revolves around three women (Dunst, Isla Fisher and Lizzy Caplan) who are asked to be in the wedding of a friend (Rebel Wilson) they formerly bullied in high school. The night before the big day is debauchery-filled with sex, drugs and alcohol, among other things.

In the movie, there is a scene where Dunst has quick - but very verbal - sex in a strip club bathroom with "X-Men" star James Marsden.

"You just roll with it," Dunst told E! of filming the sex scene. "You hope that you're working with somebody who is chill and not weird and is like, 'Can I touch you here? Can I touch you there?' No! Let's just go for it and get it over with."

For the "Spider-Man" actress, this role is quite different from any other she has played.

"I've wanted to do a comedy but it's hard sometimes because people don't see you in a comedic way, even though I did most of my teen roles in comedies," she said. "This was perfect time and a perfect script."