Keira Knightley Warns Boyfriend Off Co-Star Kirsten Dunst  7/11/05

Keira Knightley has warned her model boyfriend Jamie Dornan to stay away from his new co-star Kirsten Dunst.

The upcoming actor has landed his first movie role in drama Marie Antoinette, where he plays a courtier who is infatuated with the legendary French queen - played by Dunst.

Although Pirates of the Caribbean star Knightley is pleased for her Irish beau's big break, she is scared he will fall for the Spider-Man beauty. 

A production company insider says, "It's quite a big role and we were very impressed by Jamie's audition. His character Hans is an admirer of Marie Antoinette and his love goes unrequited.

"But Keira has made it pretty clear to Jamie that once the cameras stop, he's all hers."