The 30-year-old singer had no time to waste in slimming down as the May dates for her four-concert weekend in Atlantic City, NJ approached, reported Us magazine.
The star had to squeeze her body into custom-made Ralph & Russo designs, including a midriff-baring, fringed two-piece adorned with Swarovski crystals for her first gig post pregnancy.
"Y'all have no idea how hard I worked! I had to lose 60 pounds. They had me on that treadmill. I ate lettuce," Beyonce exclaimed to her fans during her concert at Revel Beach's Ovation Hall Saturday night.
And now that the superstar is halfway through her much-anticipated, post-baby concert return, she's celebrating.
"Now tonight I'm gonna get chocolate wasted!" Beyonce told her fans.
Saturday's show proved to be quite the star-studded event: Michella Obama and her daughters Malia, 13, and Sasha, 10, were in attendance.
"They sat up in a private balcony with Gayle King. Michelle was jamming out to 'Crazy in Love'. When Beyonce told the crowd to get up and jump, [Malia and Sasha] stood and started dancing and jumping. They were shouting when Beyonce asked, 'Do girls run the world?'
"Together, all three of them did the 'Single Ladies' dance moves," a concertgoer said.
