Natalie Portman goes topless for Dior

Natalie Portman is enjoying her last few months of single life by posing topless for her new Dior perfume ad.

The sexy Black Swan star poses provocatively in the new Miss Dior Cherie campaign, covering her breasts with her arms as she steams up the camera, wearing nothing but a dark blue bow in her hair.

Portman was unveiled as the new face of Parfums Christian Dior last month. Screen ads for her campaign will be directed by stylish Sofia Coppola.

The actress stunned fans and friends late last month when she announced she was engaged to choreographer Benjamin Millepied and expecting his child.

Portman has been wowing fashion critics during her Black Swan promotional tour with a beautiful array of maternity outfits.