You might remember the photo Suki Waterhouse posted on Instagram (before quickly taking it down) of herself with Cara Delevingne, Sienna Miller, Margot Robbie, Britain’s Princess Eugenie … and a ‘mystery man’ in joke glasses.

The man in question was Prince Harry, and Margot has been asked many times since about how she came to be in a photobooth with the Royal.

Now, the Australian actress has shared some more backstory to the photo: that it was a slightly awkward moment, since she and Cara had once pranked the prince.

“Cara knows Harry and while we were filming Suicide Squad she was like, ‘Let’s prank-call him,’” she told The Sun.

“I said, ‘We can’t prank-call ­royalty’, but anyway we did — and he was so cool with it. Prince Harry is so nice. England literally has the coolest royalty in the world.”

She said she later cringed when she came face-to-face with him at the party where the infamous photo booth pic took place.

Judging by the fun Harry, now engaged to Meghan Markle had in the photobooth, Margot thinks he should have one at his May 19 nuptials.

“He loved the booth though, I think he should get one for the ­wedding for sure.”

It’s not clear if Robbie has received an invitation to the royal wedding, where it’s understood the Spice Girls will perform at the reception.