Girls go wild in Bachelorette film

Kirsten Dunst has described her new movie Bachelorette as a "raunchy girls' comedy".

The Melancholia star is joined by Isla Fisher and Lizzy Caplan in the Bridesmaids-style comedy, which sees three old friends reuniting to be bridesmaids for a woman they used to hate at school (played by Bridesmaids' Rebel Wilson).

"Certain people, it's too much for them. But it's a raunchy girls' comedy. You don't see many of those, like, this raunchy," Kirsten told ABC7 at the film's Los Angeles premiere.

Her co-star Isla, who smouldered in a Reem Acra red lacy dress, said: "These are horrible girls doing horrible things. You can't ask yourself why. You just got to commit to it and enjoy it and just try to make it as funny as you can."

Lizzy, in a white bustier gown, added: "You're not going to hear one apology from me. It's pretty nasty, this movie, and I love every second of it."

Their male co-star James Marsden admitted there's a scene in the film that leaves him red-faced.

"There's a moment in this movie where I just can't watch what I did on set, not proud of it," he said.

Filmmaker Leslye Headland, who wrote and directed Bachelorette, revealed she wanted to make an impact with her first film.

"I think it's a really good move for a filmmaker like me who's writing something that is very raunchy, that's very dark, that's outside the box so it's not necessarily going to have a big huge marketing campaign or anything like that," she said.