Over the Christmas holidays the blonde beauty enjoyed a raucous photobooth session with Prince Harry at mutual pal’s Suki Waterhouse’s party.
But according to the Wolf Of Wall Street star, she was oblivious to the fact she was chatting with the fifth in line to the British throne.
During an interview alongside her co-star Tina Fey as she promoted her latest flick Whiskey Tango Foxtrot, the 25-year-old was asked by ET about their encounter.
“I didn't know it was him for about half an hour talking to him,” Margot confessed.
“Suki was having a housewarming party. I was like, "I'll pop in for 10 minutes." About six hours later the photo booth happened,” she added.
“The hot ginge?” Tina joked.
After the actress was shown the photos from the night by ET, Tina teased: “Looking at this picture, I can't imagine why you weren't aware of who was with you or your surroundings.”
Well, it looks like Margot just isn’t as big a fan of Prince Harry as us. We'd recognise the Hot Ginge in a heartbeat.