Lady Gaga Celebrates Her 30th Birthday with Taylor Swift, Kate Hudson and Celeb Pals

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Lady Gaga's 30th birthday party was golden!

Mother Monster partied at the No Name restaurant in West Hollywood, California, on Saturday night with her fiance, Taylor Kinney, and a bevy of A-list pals

The "Born This Way" singer channeled '80s prom queens for the night, rocking a short gold dress with giant puffy sleeves and ultra-high black platforms. Even though Gaga's makeup was toned down from her trademark over-the-top look, the overall style was super glam.

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The bash was attended by many of Gaga's A-list pals, including Taylor Swift, Lorde, Kate Hudson, Nick Jonas, Lana Del Rey, Chrissy Teigen and John Legend, Pharrell, Ashlee Simpson and Evan Ross, Kathy Bates, Kylie Minogue, Lisa Vanderpump, Suki Waterhouse, Lisa Rinna and Harry Hamlin, and Mark Ronson.

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Hudson posted to Instagram before heading to the party, captioning the photo with the hashtag "#LetsGoCelebrateALadiesBDay."

Inside the party, an eyewitness tells ET that Gaga, whose actual birthday is March 28, sang her hit song "Paparazzi" and even made a joking reference to the "nice paparazzi" gathered outside the bar.

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One attendee arrived with a piece of art created by Michael Jackson that is valued at $2 million, which had been specially requested by Gaga. Talk about one lucky lady!

Guests partied at the exclusive club until around 2:30 a.m, with sources saying Swift and Lorde left together. Gaga, Kinney and Hudson closed the night out, partying past 3:30 a.m.

Gaga has been engaged to Kinney, the 35-year-old Chicago Fire actor, since February 2015. Check out more of the cute couple in the video below.