It’s a reunion 35 years in the making, thanks to mayonnaise. More than three decades after the romantic comedy “When Harry Met Sally” first hit theaters, Billy Crystal and Meg Ryan are finally back together.

It's time to return to Katz's Deli with the stars of "When Harry Met Sally" – this time though, it's for a Super Bowl ad

Billy Crystal and Meg Ryan will recreate a famous scene from 1989's 'When Harry Met Sally' for a Hellmann's Super Bowl commercial

Meg Ryan and Billy Crystal recreated a classic scene from "When Harry Met Sally" for a new Super Bowl ad, with a special appearance by Sydney Sweeney.

When I opened my Instagram feed and saw a picture of Meg Ryan and Billy Crystal together again, my first reaction was "AH!" — especially since they're sitting on a couch, just like they do at the end of When Harry Met Sally.

“When Harry Met Sally…” stars Billy Crystal and Meg Ryan spoofed their classic scene from the iconic 1989 romantic comedy in which Ryan’s character, Sally, fakes an orgasm at lunch at Katz’s Delicatessen in New York City by parodying it in a Super Bowl ad for Hellmann’s mayonnaise.

Super Bowl LIX is already proving to offer serious star power, with ad spots led by Chris Pratt, Eugene Levy, Michelle Rodriguez and even a When Harry Met Sally reunion with Meg Ryan and Billy Crystal.

It was so much fun,” Crystal told The Post of reuniting with Ryan more than three decades after their iconic 1989 rom-com.

Meg Ryan and Billy Crystal have finally reunited. The two When Harry Met Sally stars paid homage to their 1989 film on Instagram, with Ryan writing the caption, “It’s finally happening, we’re reuniting for something iconic.

Meg Ryan and Billy Crystal recreate the "I'll have what she's having scene" from their famous film in new Super Bowl ad.

The commercial, created by VML, was shot at the famed Katz’s Deli, with Meg and Billy back at the same table where they filmed the original scene, as well as Sydney delivering the famous line from the same table it was delivered at 35 years ago.