The 30-year-old singer - who gave birth to daughter Blue Ivy on January 7 - was out in New York City to watch her husband Jay-Z perform at Carnegie Hall on Monday night.
She wore a tight-fitting red Alice by Temperley dress teamed with oversized gold hoop earrings and Christian Louboutin platform heels.
Jay-Z looked visibly choked up when he performed Glory - the song he wrote for his new baby girl.
"You could tell Jay is over the moon," a source told Us Weekly. "He asked the crowd if there are any proud parents out there. Then after he said, 'I didn't think I was gonna make it through that one - that was tough'."
During the benefit concert, Jay-Z was joined on stage by Alicia Keys and the pair performed their hit duet Empire State of Mind.
After the show, a host of stars attended the official after-party at Jay-Z's 40/40 club, where Beyonce chatted with the guests.
"She made a much bigger effort to say hello to nearly everyone, making rounds around the whole club before joining Jay-Z and guests in the VIP room," an onlooker revealed.
Jay-Z performed for the first time at Carnegie Hall to raise money for his Shawn Carter Scholarship Foundation and The United Way of New York City, which gives talented students financial assistance to attend college.