Beyonc Knowles reportedly partied up a storm over the weekend.

The 30-year-old singer was out with her younger sister Solange and two other female friends at W.I.P. club in New York City.

An eyewitness told People magazine that Beyonc, who welcomed daughter Blue Ivy back in January, let loose on the dance floor and loved moving to 90s, hip-hop and disco music.

"Beyonc looked amazing and was having a great time with her friends," an onlooker said. "She was very laid back, smiling and in a great mood."

The Single Ladies star was seen chatting and laughing with her girlfriends while they drank vodka cocktails in a VIP booth.

Oscar winning actor Cuba Gooding Jr. apparently stopped by to say hello before they left the club around 3am.

Star magazine recently claimed that Beyonc and her rapper husband Jay-Z are already thinking about having baby number two.

"They see no reason to wait," the source told the publication. "Beyonc has said giving birth and dropping the baby weight was far easier than she thought."