Taylor Swift Celebrates Her Birthday with Beyonce, Jay-Z, Justin Timberlake

— -- Taylor Swift's birthday party rivaled any major Hollywood event.

The singer, who turned 25 Saturday, celebrated with a bash attended by a who's who of A-listers, including Jay-Z and Beyoncé, Sam Smith, Justin Timberlake and Selena Gomez.

After performing at Madison Square Garden in her newly adopted hometown of New York City, Swift threw what Kelly Osbourne called "one of the best parties I have ever been to" at her downtown apartment.

The bash, also attended by Osbourne, Chrissy Teigen, Karlie Kloss, Nick Jonas and Olivia Culpo, Ansel Elgort and more, raged until 5 a.m., according to E!. Understandably, cake wasn't enough to feed the whole crew, and three pizza delivery men reportedly arrived with about 40 pies in tow.

While many of her star friends were clearly enjoying the party, it was Swift who seemed the happiest of all.

"I just want to thank anyone who wished me happiness today. You're my friend," she tweeted before referencing photos from her celebration. "These are my friends. And I'm so lucky."