Taylor Swift performed ‘I think he knows’ as her surprise song in the Foxborough, Massachusetts The Eras concert on Sunday. Fans were in awe of the singer.

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Swift performed in front of a packed crowd at the Gillette Stadium. ‘I think he knows’ is a track from her 2019 album Lover. “This is a song that was just so fun to make,” the 11-time Grammy winner introduced the song on Sunday.

Watch Swift’s performance:

Fans reacted to Taylor Swift’s surprise song on social media.

“i’m never getting over taylor performing i think he knows acoustically,” a Twitter user wrote.

“i think he knows deserved a spot on the set list and i’m so serious about that,” another one added.

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“i think he knows AND red in one night i am DONE with taylor swift !!!!!!” a third one tweeted. ‘Lover’ was the singer’s second surprise song.

During her The Eras performance on Saturday, at the same venue, Taylor Swift dropped a hint about her personal life. She and Matty Healy of 1975 are rumored to be dating.

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“I’ve just never been this happy in my life in all aspects of my life ever,” Swift told fans. “And I just want to thank you for being a part of that.”

“It’s not just a tour. I just sort of feel like my life finally feels like it makes sense. So, I thought I’d play this song, which brings me a lot of happy memories,” she added.

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The video went viral on social media.

Swift performed for 3.5 hours with continuous rainfall on Saturday.

“Last night we all danced together in the rain for THE ENTIRE 3.5 HOUR SHOW. just want to thank that iconic crowd!! Love you so much you have no idea,” she tweeted on Sunday morning.

The Eras Tour is Taylor Swift’s first concert tour since 2018. It kicked off at State Farm Stadium in Glendale, Arizona, in March and has a massive 44-song setlist.

Meanwhile, Healy and Swift have been spotted together on multiple occasions. Page Six, citing a source, also reported that the two were spotted kissing in a New York City restaurant. The Grammy-winner broke up with actor Joe Alwyn after a six-year relationship earlier this year.