Natalie Portman's taking it all off ... as the new face of THE Parfums Christian Dior line, and specifically in a sexy new ad for Miss Dior Cherie.
Wearing just a black bow in her hair, the pregnant and engaged star gives a sexy look over her shoulder in her first cosmetics endorsement deal.
The ad appears to have been shot prior to the Black Swan and No Strings Attached star announced her pregnancy with Benjamin Millepied ...
MISS DIOR: We're pretty jealous of Mr. Dior right now, we can't lie.