Margot Robbie might play a journalist in Whiskey Tango Foxtrot, but her investigative skills in real life could use an upgrade.
The 25-year-old actress was snapped in a photo booth with none other than Prince Harry over the Christmas holiday, but she told ET she didn't recognize him at first.
WATCH: Tina Fey Masters the 'Taliban Shuffle' in War Comedy 'Whiskey Tango Foxtrot'
"I didn't know it was him for about half an hour talking to him," Robbie admitted.
The photo booth shot also included Cara Delevingne, Sienna Miller and Suki Waterhouse.
"Suki was having a housewarming party," Robbie explained. "I was like, 'I'll pop in for 10 minutes.' About six hours later the photo booth happened."
WATCH: Prince Harry Reportedly Had a Fling With American Actress Juliette Labelle
Robbie's co-star Tina Fey joked that the drinks seemed to be flowing plentifully at the event.
"Looking at this picture, I can't imagine why you weren't aware of who was with you or your surroundings," Fey teased.
In the movie, two-time Golden Globe winner plays a journalist sent to Kabul, Afghanistan on assignment. The war comedy is based on reporter Kim Barker's memoir, The Taliban Shuffle: Strange Days in Afghanistan and Pakistan.
WATCH: Tina Fey Jokes 40-Year-Olds Need to Party More Than Teenagers
Whiskey Tango Foxtrot opens March 4.