Page Six was first to report the news on Wednesday. Our source says Stone met McCary when she hosted SNL last December, where she starred in the sketch "Wells for Boys," which McCary directed.
"Not many people knew about Emma and Dave," the source says of their super private relationship. "It’s been clear that they were trying to keep this low key."
She also made a surprise appearance on the show last month to support her La La Land co-star, Ryan Gosling, during Gosling's monologue. But romance rumors between Stone and McCary began heating up in July, when she was spotted supporting McCary at the premiere of his big screen directorial debut, Brigsby Bear.
The Oscar-winning actress' last public relationship was with Andrew Garfield. The two split in 2015 after dating for four years, but remain on friendly terms. Last October, Stone referred to her Amazing Spider-Man co-star as "someone I still love very much" in an interview with Vogue.