Mary J. Blige Surprises Fans with Prince Duet at iHeartRadio Fest

Giving fans more than they expected, Mary J Blige brought out Prince to join her on state at the 2012 iHeartRadio Music Festival on Saturday (September 22).

After the R&B powerhouse belted out hits like "Fine," she stopped her band to announce, "I got a real good friend in the building. He's one of the most amazing artists to ever walk the earth."

The 41-year-old diva and an afro-sporting Prince collaborated on "Sweet Thing" and "Nothing Compares to You" to a thrilled audience.

After the surprise, Mary tweeted, "Just brought out Prince to share my special moment at the #iHeartRadio Music Festival." Watch the video of the two performing at the festival below.