If you found Margot Robbie's loose braids at the Cannes Film Festival photo call a little unexpected, she had a reason for wearing them. The throwback hairstyle was a nod to slain actress Sharon Tate, who Robbie plays in her new film Once Upon a Time in Hollywood. Spotted by writer Evan Ross,Tate wore her hair with face-framing braids at the Cannes Film Festival in 1968.