Emma Stone sex tape? Sources say it's real - report

Oops ... Emma Stone has reportedly joined the ranks of celebs with sex tapes.

Radar Online reports the "Gangster Squad" star, who is currently dating her "Amazing Spider-Man" co-star, Andrew Garfield made a home porn video before she was famous.

"Emma Stone has a sex tape and that's a fact," says the source. "She made it long before she started dating Andrew Garfield, and before she really became a household name. She was just young and probably thought nothing would ever come of it."

The tape reportedly is not up for sale at this point, and remains in the possession of her on-screen partner.

Stone and Garfield have been together since meeting on the "Spider-Man" set in 2011. The couple lives together in New York City.