You can't fake this chemistry!
Real-life couple Michael Fassbender and Alicia Vikander play married in their tear-jerking new film, The Light Between Oceans, in theaters on Sept. 2, 2016. In an interview with ET's Carly Steel, the duo recall the first time they actually met before working together on the film.
WATCH: Alicia Vikander and Michael Fassbender Share the Screen for First Time in Tragic 'The Light Between Oceans' Trailer
"We had met at Toronto Film Festival and just on the dance floor," Vikander revealed, with Fassbender chiming in: "I thought [I was a good dancer] until she started dancing and then I felt like I had two left feet."
The duo say they first "properly" met during rehearsals for the film in 2014, but their chemistry, Fassbender says, "was sort of there from the beginning."
While the tone may have been serious in front of the cameras, Vikander and Fassbender say they kept their party moves going behind the scenes.
"There was a load of dancing in the mornings, actually," Vikander reveals, Fassbender adding: "Because it was cold."
(Aww, they're finishing each other's sentences!)
WATCH: Michael Fassbender Praises Girlfriend Alicia Vikander, Is 'Very Proud' of Her Phenomenal Year
Apparently, the cast would gather in a wood shed on set, where the makeup team was set up -- with BB guns. "We had the headshots of everybody on the wall and we were shooting them," Fassbender exclaims, prompting a laugh from Vikander. "And we had a lot of good music dancing in the morning."
But once the cameras were rolling, it was all business for these lovebirds. In fact, Fassbender couldn't help gushing over his girlfriend's star power in our interview.
"She's a very fierce performer and very brave," he says. "It's impressive to see."
All that bravery scored Vikander an Academy Award earlier this year for her role in The Danish Girl. Re-live the sweet moment she won -- and planted a big smooch on Fassbender -- in the player below.
WATCH: Alicia Vikander Thanks Boyfriend Michael Fassbender With a Kiss After Oscar Win