On Friday, Emma Stone was one of over 60,000 fans in the stadium at the opening night of Taylor Swift’s Eras Tour in Glendale, Arizona. She and Swift are friends in real life, but when Stone is in the audience, she is all stan.

Another attendee took a clip that went viral on TikTok of the 34-year-old actress in the VIP section of State Farm Stadium singing loud and proud to Swift’s hit track “You Belong With Me.”

Over the video, the TikToker @oreoofficial wrote, “Emma Stone losing her gd mind over YBWM.”

In another video, Stone was captured enjoying herself again, this time singing to “Fearless.”

Swift was losing it a little herself as she took the stage for her first tour in five years, telling the crowd, “I can’t even go into how much I’ve missed you… I don’t know how to process all of this and how it’s making me feel right now… let me start by saying you’re making me feel fantastic.”

Later, she interrupted some stage patter to say, “I’m trying to tell you I love you and I’m babbling.”

Her set was split into sections for each of her 10 albums, beginning with tracks from her 2019 album Lover, singing “Miss Americana & The Heartbreak Prince” followed by “Cruel Summer.”

There were lots of throwback hits for the fans who have followed Swift for over a decade, but she also did seven songs off of her more recent album Folklore, and another seven off her most recent album, Midnights.

Stone and Swift first met in 2008 at the Young Hollywood Awards and quickly became close friends.

Stone even brought Swift with her as a date to the premiere of her movie Easy A in 2010.

Stone was also reportedly present for Swift’s Reputation tour in New Jersey in July 2018. She is her bestie’s number one fan.