Most people’s honeymoons involve sun, sea, sex and sand (just like the Havana Sands song suggests), but Margot Robbie isn’t most people.

Sitting down on The Ellen DeGeneres Show, the I, Tonya star revealed that her romantic break away with her new husband, Tom Ackerley, involved a chance encounter with former president Barack Obama – and a pair of very tiny shorts.

“I’m scared because my husband’s going to kill me for telling this story,” said Robbie, “but it’s my favourite story ever and it’s the story of how Ellen and I met.”

The actress then proceeded to set the scene: a luxury hotel, a sun-kissed island and a sudden burning desire to go to the gym.

Ackerley, perhaps failing to anticipate that he’d be working out on honeymoon, had failed to pack accordingly – and wound up making a pretty questionable fashion choice.

“We get changed to go to the gym and Tom puts on these shorts that are like, his oldest gym shorts, and they’re tiny. And they’re like really short and there’s nothing underneath,” Robbie told DeGeneres.

Robbie later added: “I was like, ‘Babe, you cannot wear those shorts… I can see everything.’”

After a quick deliberation, Ackerley persuaded Robbie that they wouldn’t run into anyone important.

“And so we walk into the gym, and running on a treadmill is Ellen,” recalled Robbie. “And then on the treadmill next to her is Portia, her wife.

“That’s not even the best bit, but already Tom and I are like, ‘Oh my God.’ And Tom’s face has like just gone white.”

Robbie continued: “And standing next to [Ellen and Portia] is former President Barack Obama… I’m not kidding – in a gym that’s tiny.”

What could make this chance encounter more awkward, you ask? A class that involves a lot of stretching – and really pushes Ackerley’s attire to its limit.

“It was a very confined space, and we then had to do this whole, like — we had to do this stretching class and Tom meanwhile is trying to like, not reveal anything,” said Robbie.

“And he’s dying and I’m crying so much, I’m about to crack a rib… and Tom’s trying to lunge cross-legged and Obama’s like stepping over his legs to put his weights back. And the whole thing was so absurd.

“We literally got to the end of the class and we’re doing a last stretch, which was legs out like this,” Robbie said, mimicking the stretch.

“And Tom’s now got a towel on his crotch, trying to be modest and his face just says it all. He’s like, ‘I’m gonna kill myself, this is the worst day of my life.’”

Robbie, though, loved it: “It was honestly one of the funniest things that’s ever happened.”

Robbie recently revealed that she hates the idea that marriage is a magical potion that serves to amplify adoration, reduce deep-seated feelings or resentment and erase all fears of commitment. 

The only thing that has changed after her low-key wedding is the fact that she now has the option to wear a wedding ring. 

However, the actress – who married Ackerley in an intimate surprise ceremony – made sure to stress that she only does this when it is practical or convenient for her to do so.

“That’s the thing, [Tom and I] were best friends and roommates before and now we’re like best friends and roommates still, so nothing’s really changed at all,” Robbie told Vogue Australia.

“Other than the fact that I get to wear this [ring] on the weekends.

“I obviously can’t wear it during the week when I’m working – I don’t want to lose it on set!”

Images: Rex Features