Slideshow: All the Looks From Beyoncé’s Epic Memorial Day Weekend Concerts

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ATLANTIC CITY, NJ - MAY 26: (EXCLUSIVE COVERAGE) Beyonce performs on stage at Ovation Hall at Revel Resort & Casino on May 26, 2012 in Atlantic City, New Jersey. (Photo by Kevin Mazur/WireImage) Photo: Kevin Mazur/WireImage

Beyoncé performed four times at Revel in Atlantic City over the long weekend — her first concerts since giving birth back in January. Those in the crowds included First Lady Michelle Obama, with daughters Sasha and Malia; Us Weekly reported the trio sang along and even danced to "Single Ladies." In costumes designed by British label Ralph & Russo, Beyoncé showed off the results of lettuce meals and treadmill workouts: 60 pounds of pregnancy weight completely gone. Click through our slideshow to see that trim figure and the many glitzy outfits that semi-covered her during the shows.