All of the Unforgettable Moments I Witnessed at Mary J. Blige's Strength of a Woman Festival

The official announcement for Blige's festival already teased some surprise guests, but no one at Glasper's first show on Thursday was prepared to see Luke James pop up on stage for an impromptu performance. (Though the audience certainly didn't mind the handsome singer showing off his mesmerizing vocals.)

The Grammy-nominated "To Feel Love/d" artist and actor treated the crowd to tracks like his 2013 song "Oh God" and Glasper's "Ah Yeah," originally sung by Musiq Soulchild and Chrisette Michele.