Vardalos and Corbett practiced their first kiss off-camera, leading a hairstylist for the film to believe they were having an affair.
Speaking to ABC in 2018, Vardalos explained the mix-up came about after she admitted to the "Sex and the City" star that she was nervous about kissing in front of everyone on set, because she'd never done a kissing scene before.
As a result, she wanted to "get it over with" ahead of time, which led to her and Corbett sharing a rehearsal smooch by the makeup trailers.
"I'm really nervous about everyone seeing it, and could you just — could you just kiss me right now and let's just get it over with?" Vardalos recalled asking Corbett.
"And he goes, 'Right now?' And I go, 'Yeah, just kiss me right now.' And he goes, 'OK.' So he just kissed me, right now. And I was like, 'Oh, that was easy.' So by the time we were on the set filming it four hours later, it was fine. It was easy. I wasn't embarrassed," she continued.
It wasn't until years after filming that the pair found out that someone had seen them after all.
"We found out years later that the hair artist on the movie had come out of the makeup trailer at that moment, seen us kissing, and went, 'Oh, they're having an affair,'" Vardalos said.