The actress was spotted at a photocall for her new directorial debut, "A Tale of Love and Darkness" at the 68th Annual Cannes Film Festival in Cannes, France on Sunday.
The Hebrew-language film -- which also stars the brunette beauty -- was adapted from the memoir of Amos Oz, an Israeli writer/journalist.
Portman stunned at the event wearing a sheer, black Rodarte dress complete with colorful sequins. The "Black Swan" actress finished her look with black strappy sandals and wore her hair pinned-back in a braid.
Natalie gave fans a real treat when she posed for photos from behind, and showed off her booty in the high-fashion number.
It's definitely a rare racy red carpet moment from the Oscar-winner -- and we're loving it!
The 33-year-old definitely has the body to pull this off this sexy dress -- what do you think about Portman's look? Tell toofab in the comment section below and click "Launch Gallery" above to see more red carpet photos from the 2015 Cannes Film Festival!