In New York City on Friday, iHeartRadio’s Z100 Jingle Ball was the place to be in terms of fun. People at Madison Square Garden were on their feet as the singer sang some of her biggest hits, such as “Blank Space,” “You Need to Calm Down,” and “Shake It Off.” Swift not only opened the show, which also had performances by the Jonas Brothers, Lizzo, and 5 Seconds of Summer, but she was also 30 years old.

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The singer talked about the important event during the show before singing her hit song “Lover.” She told the crowd, “I had a choice.” “Where do I want to celebrate turning 30?” That’s right, you’re seeing it. It’s my 30th birthday today, and this is my first show. At the end of her set, she was even surprised with a big cake that had pictures of her three cats on it. The crowd then sang her a song. Follow the link to see more pictures from her amazing performance at Jingle Ball.