Taylor Swift has a fan in Keith Urban — and the feeling is mutual.
The Australian country star covered Swift's newest single, "Lover," at the Washington State Fair on Saturday night.
In a video he posted to Instagram on Sunday, Urban, 51, wrote, "Every now and then you hear a song that you love and wish you’d written…. and a HUGE thx to my band as well – we didn’t get to rehearse so…. this is us fully winging it."
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Swift, 29, caught wind of the cover and fangirled in her own Instagram Story.
"Keith Urban covering 'Lover' flawlessly," she wrote. "I am screaming. This is so beautiful."
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Swift's seventh album, also titled "Lover," dropped on Aug. 23. On Sunday, it officially became her sixth album to rocket to No. 1 on the Billboard charts.
According to Billboard, "Lover" sold more in five days than any other album in its first week since Swift's 2017 record, "Reputation."
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"Lover" features a whopping 18 tracks, including several songs about her three-year relationship with British actor Joe Alwyn, according to People.
"Lover" is highly personal for Swift, who's currently engaged in a feud with Scooter Braun and former Big Machine label head Scott Borchetta over ownership of the masters to her first six albums.
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"It’s the first album of mine that I’ve ever owned," she tweeted of "Lover," "and I couldn’t be more proud."
Fox News' Brie Stimson contributed to this report.