The Born This Way singer, who turned 30 today, headed to the No Name Club in Hollywood, clad in a metallic dress, to ring in her big day with a host of famous friends on Saturday.
Among the guests included Taylor Swift, Lana Del Rey, Lorde, Kate Hudson, Pharrell Williams, John Legend and his pregnant wife Chrissy Teigen, Kathy Bates, and Gaga's actor fiance, Taylor Kinney.
According to TMZ.com, the superstar performed at the party and was gifted with a famous 1990 Michael Jackson sketch, called Dancing Feet.
Lady Gaga has a lot of reasons to celebrate her upcoming milestone – in January, she won her first Golden Globe award for her role in American Horror Story: Hotel and she earned her first Oscar nomination for Best Achievement in Music Written for Motion Pictures, Original Song for documentary The Hunting Ground.
She also enjoyed the spotlight as she sang the US National Anthem at the Super Bowl last month and performed a tribute to David Bowie at the Grammy Awards.
The singer's personal life is also on the up and up as she plans her nuptials to Taylor. The couple is reportedly preparing to celebrate with a big Italian wedding with Gaga's whole family.
"She wants to celebrate her heritage, so they're looking at places in the Italian countryside. She wants a big Italian wedding," an insider told the New York Post earlier this year.
However, Taylor is fine with a small setting for the nuptials, but he wants his bride-to-be to have the bash of her dreams.
"I told her I don't mind doing the little white chapel thing. She wants what she wants," he said last year.
"I want to make sure that it's right what she wants. We're going to take our time and do it right."