After starting the celebration off while performing at the New York City Jingle Ball (where she asked the crowd to scream loudly in honor of her birthday), the singer – who turned 25 on Saturday – kept the festivities going offstage at her apartment.
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Swift, who was already dressed for the night in the plaid two-piece outfit she wore to the annual holiday concert, was all smiles as she arrived at her Tribeca pad, where she was joined by Jay-Z, Beyoncé, Justin Timberlake, Sam Smith, Karlie Kloss and the girl band HAIM.
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"So this is being 25 ... #WHAT #bestbirthdayEVER," she captioned a group photo of all the partygoers on Instagram.
With such a star-studded guest list – which also included Selena Gomez, Jaime King, Emma Roberts, Ansel Elgort, Kelly Osbourne, Nick Jonas and Chrissy Teigen – we can't imagine what Swift wished for when she blew out her candles.
But, hey, it's her party and she can ... shake it if she wants to.
On Saturday, Charli XCX shared a couple of pics from the festivities and commented, "owww my thighs ache so much from dancing last night!"
And Swift posted a shot on Instagram of her birthday present from pal Lena Dunham: a kitty necklace that she described as "my new most cherished possession."