Portman looked gorgeous in a stunning black, fringe-lined, sheer gown that actually revealed the 33-year-old star's black underwear.
The sultry star completed the semi-risqué ensemble with sexy, strappy black heels.
The photo call was held in France at the Cannes International Film Festival, and was for Portman's upcoming film A Tale of Love and Darkness.
Portman stars in the Hebrew-language film, which is based on the memoir of Israeli writer Amos Oz. It is also the star's directorial debut.