Page Six reports that the two have been dating for months. Stone hosted the NBC sketch series last December. Earlier this month, she made a surprise appearance when her "La La Land" co-star Ryan Gosling hosted the show. She then attended the afterparty at hotspot Tao.
The 28-year-old beauty also attended the premiere of indie movie "Brigsby Bear", which McCary directed and stars his childhood friend Kyle Mooney, in June. The rumored lovebirds were caught on camera leaving together after the special screening.
Stone and McCary have not responded to the dating rumors. Should the report be true, Stone will be the latest Hollywood star to date an "SNL" staffer. Ben Affleck has gone public with his romance with "SNL" producer Lindsay Shookus, while Scarlett Johansson has been rumored seeing "Weekend Update" anchor Colin Jost after they were caught kissing at an "SNL" afterparty following her guest-starring appearance in May.
Stone dated Andrew Garfield after they met on the set of "The Amazing Spider-Man" in 2010. They called it quits in October 2015. Despite their split, the two couldn't stop gushing about each other. "He's someone I still love very much," Stone said of the "Hacksaw Ridge" actor, admitting that she was having a hard time following the breakup. "It's been interesting [since we split]. It's been a good year. And sad. Pros and cons," she added.
That's why it was not a surprise when rumors swirled in August that they might rekindle their romance as it's reported that the "Crazy, Stupid, Love." star made a number of trips to visit Garfield in London while he worked on "Angels in America" production, but that's never confirmed.