After she opened the show with a set that included her new holiday song "Christmas Tree Farm," iHeartRadio's Elvis Duran brought out a birthday cake on stage (which featured the faces of her cats), and everyone at Madison Square Garden in New York City erupted into singing the superstar Happy Birthday.
Katy Perry said, "Welcome to the Dirty 30s Club, Ms. Swift. Hi honey, it's your friend Katy, and I just want to wish the happiest birthday."
Camila Cabello told her friend, "Taylor, I absolutely love you. You know how much I love you. I hope you have the best, most cat-filled, most Lover-filled, most incredible birthday. We all love you so, so much."
And Niall Horan said, "Taylor, it's your good friend Niall here. Just wanted to wish you a massive happy birthday. I love you lots, you're a great person."
During her Jingle Ball set, Taylor performed many fan favorites, including "Blank Space," Me!," and an acoustic version of "Welcome To New York." She also performed songs from her new album Lover, like the title track "Lover" and "You Need to Calm Down."
And since Jingle Ball is a holiday-themed show, Taylor also performed her brand new song "Christmas Tree Farm" as the adorable video featuring footage of her childhood growing up on an actual Christmas tree farm played in the background behind her.
To end her incredible Jingle Ball performance, Swift ended with the epic "Shake It Off."
If you missed any part of the show, or just want to relive the night — we’ve got you covered. The CW Network will broadcast the iHeartRadio Jingle Ball as a nationwide special on Thursday, December 19th at 8pm ET featuring this year’s most incredible performances from the annual holiday event.
Photos: Getty Images