The pair attended the Screen Actors Guild Awards Saturday, and much to the Game of Thrones actresses delight, Gosling was seated directly behind her.
A fan of the Hollywood heartthrob, Turner quickly snapped a selfie with Gosling while he was distracted talking to another woman at his table.
"Sorry boys. I'm off the market," Turner joked on Instagram Sunday alongside a photo of the secret selfie featuring the delighted 19-year-old smiling in excitement.
Turner will once again star as Sansa Stark when Game of Thrones returns to HBO on March 24.
At the SAG awards pre-party hosted by Entertainment Weekly Friday, Turner spoke about the upcoming season and what's in store for her character.
"I mean this season is a really, really big one for Sansa," she said. "It's probably her best season yet. It's her really coming into her own. She, this season, really commands the respect that she deserves and she grabs hold of it and she runs with it and it's really good."