So, when exactly did Emma Stone fall in love with longtime friend Taylor Swift? When the two superstars were just teenagers, as it turns out! In a New Year’s Day The Graham Norton Show interview (Jan. 1), Oscar-winning actress Emma Stone opened up about her friendship with Swift, her Eras Tour experiences and Speak Now (Taylor’s Version) vault track “When Emma Falls In Love.”

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Stone, who won the best actress Oscar for her performance in 2016’s La La Land, revealed that she has attended the Eras Tour “three [times] so far,” including the tour’s opening show in her hometown of Phoenix, Ariz. “Mandy Moore, who was the choreographer of La La Land, was [Taylor’s] choreographer for the tour,” Stone explained. “So it was a bunch of lovely things all come together, and it was incredible to see.”

Moore’s choreography and Stone’s performance were two key elements that resulted in La La Land’s resounding success. At the 2017 Academy Awards, the Damien Chazelle-helmed film won six awards from 14 total nominations, a haul that helped the movie join All About Eve (1950) and Titanic (1997) as the most nominated films in Oscar history. Thanks to the La La Land soundtrack, Emma Stone is a Billboard-charting artist; “City of Stars,” her duet with co-star Ryan Gosling, reached both Digital Song Sales (No. 45) and the Bubbling Under Hot 100 (No. 8).

Nonetheless, Stone and Swift’s story stretches back years prior to their high-profile successes. According to Stone, the two met “at the Young Hollywood Awards when [she] was 18 in L.A.” She continued, “We just kept in touch ever since and became great friends.”

The most devoted Swifties have been well aware of the Stone-Swift friendship, and that knowledge provided the basis of fan theories regarding “When Emma Falls In Love,” a vault track from Speak Now (Taylor’s Version). Some fans believe that Stone is the titular Emma, but, for her part, the Easy A actress says, “You have to ask [Taylor]!” Naturally, her response drew hearty laughs from both the audience and her fellow Graham Norton guests, including Poor Things co-star Mark Ruffalo.

Watch Emma Stone spill all the Taylor Swift tea above.