Years before their date night, Selena Gomez and Zayn Malik dated.

People who know Selena Gomez and Zayn Malik won't be surprised by their rumored PDA-filled dinner date, because they've hooked up before.

When Gomez's best friend Taylor Swift was dating Malik's former One Direction bandmate Harry Styles, they had their first kiss.

Swift, who is now 33, and Styles, who is now 29, started dating in the fall of 2012, and they were first seen together in December of that year.

But a top music industry source tells us that Gomez and Malik had a thing when Taylor and Harry were dating. "They had a thing years ago, when Taylor and Harry were dating," the source says.

"It doesn't surprise me at all that they might be together [today]," says the insider.

A hostess at a popular restaurant in Soho said that she saw Gomez and Malik, who are both 30, kissing while they were there earlier this month. This made the internet go crazy.

Klarissa Garcia, a friend of the hostess who made a TikTok video about the alleged encounter, told Page Six on Friday, "No one noticed them [in the restaurant]."

"It was pretty well known, but in New York, no one really cares about famous people."

Even though Gomez and Malik were pretty private, they didn't seem to care about keeping things quiet.

We were told that they were kissing openly at their table, which was in the middle of the busy restaurant.