Da'Vine Joy Randolph, Richard Fleeshman, Beyonce Knowles, Caissie Levy and Bryce Pinkham pose backstage at the hit musical "Ghost" on Broadway on May 12, 2012 in New York City. Credit: Bruce Glikas/FilmMagic

Beyonce hits Broadway!

The "Run the World (Girls)" singer, 30, attended a performance of GHOST The Musical Saturday night, where she greeted the cast post-show--and showed off her signature, effortlessly chic new mom style.

Clad in a striped button-down and black shorts, Beyonce--who gave birth to daughter Blue Ivy January 7--sported minimal makeup and slicked her hair back into sophisticated top-knot.

Since welcoming her first child with hubby Jay-Z, the super-stylish Grammy winner has continued to stun each time she steps out--often in curve-hugging ensembles that show off her amazing, post-baby figure.

Beyonce has been working hard to shed the baby-weight in time for a May 25 Atlantic City gig--her first show since becoming a mom. Her trainer Marco Borges tells Us Weekly the singer is in the gym five days a week, focusing on "cardio and plyometric moves like lunges and jumps on and off a bench," he reveals.

Her consistency is paying off, says a pal. Thanks to her hard work, Beyonce is "loving her body!" the source tells Us.