By Dylan Kickham
Updated August 09, 2016 at 12:00 PM EDT
Credit: JB Lacroix/WireImage; Robert Kamau/GC Images

It’s no secret that Taylor Swift draws inspiration from her personal life when writing hit songs, but the Grammy-winning singer doesn’t always reveal what, or in some cases who, inspired which of her tracks. Fans have speculated for years about the famous faces behind Swift’s various chart-toppers, but Lea Michele was finally able to put one of those rumors to rest on Monday.

During a Facebook Live video to promote the upcoming second season of Scream Queens, the topic shifted to past relationships. “You dated Taylor Swift, I remember that,” Michele said, turning to her new costar Taylor Lautner. After a little laugh, Lautner responded that he didn’t want to talk about it, but Michele pressed on.

“Didn’t she write a song about you?” the former Glee star asked. “I think it’s something about a sweater and a hat, right?”

Michele continues to try to put a name to the song as Lautner laughs along. Finally, Michelle strikes gold: “It’s like, your hat in December!,” and Lautner has to reply. “It’s called ‘Back to December,'” he says.

Fans have speculated that the song, the second single from her 2010 album Speak Now, was about Lautner since its release, given that the pair had recently broken up before its debut and the lyrics mentioned “your tan skin, your sweet smile.”

Check out Lea Michele’s impressive investigative skills below, beginning around the 9:30 mark.