Niall Horan Celebrates 22nd Birthday by Singing Taylor Swift's '22': Watch

Niall Horan of One Direction
Eric Frazer/WireImage

Niall Horan of One Direction performs at Gillette Stadium on September 12, 2015 in Foxboro, Massachusetts. 

Niall Horan is feeling 22 -- because he is!

Happy Birthday, Niall Horan! Watch One Direction Sing 'Happy Birthday' at Boston Concert

The One Direction singer celebrated his 22nd birthday onstage in Foxborough, Mass., on Saturday night. First, his bandmates serenaded him with a harmonic rendition of "Happy Birthday." Then, Horan strummed on his guitar and sang a few lines of Taylor Swift's hit "22." Well, he tries to sing a few lines before admitting with a laugh, "I don't know the words."

Watch the mini-cover below:

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