Slim Beyonce Wears Sexy Cowgirl Outfit for First Post-Baby Concert

Beyonce on stage at Ovation Hall for Revel's premiere.  Kevin Mazur for Beyonce/WireImage

Sasha Fierce is back on top!

In Atlantic City on Friday, Beyonce took the stage in a skin-baring ensemble at Revel's Ovation Hall for her first concert since 2011. Her debut performance is the first of four shows this Memorial Day Weekend.

By the looks of her bod, it's hard to believe that just five months has passed since the songstress, 30, gave birth to daughter Blue Ivy — her first child with husband Jay-Z.

The slim and radiant star dazzled in a silver, fringe-adorned, cowgirl-inspired two-piece by Ralph & Russo adorned with Swarovski Elements and nude fishnet stockings. She swapped her signature cobalt blue Nails Inc. Baker Street nail color (an homage to her first-born) for a neon fuchsia polish that matched her eye-popping pink heels.

Last month, Beyonce showed off her svelte post-baby body in a sexy black swimsuit when she hit up St. Bart's. Her trainer Marco Borges tells Us Weekly, "We do cardio and plyometric moves like lunges and jumps on and off a bench."

To boost her slim down, the 5-foot-9 diva is also breast feeding and avoids processed fare, sticking to whole foods like vegetables and grilled meats. "You don't have to eat only celery sticks," Borges advises. "Be sensible and exercise constantly.

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