Mary J. Blige and Prince perform at the 2012 iHeartRadio Music Festival.

It’s not often that we get to see a pair of music’s legendary artists together onstage but last night Mary J. Blige made some of her fans’ dreams come true. In the middle of her set at the 2012 iHeartRadio Music Festival, the diva summoned Prince to the stage for renditions of Chaka Khan & Rufus’ ‘Sweet Thing’ as well as ‘Nothing Compares 2 U’.

In case you don’t know, Prince wrote and originally performed ‘Nothing Compares 2 U’ before it became a global hit for Sinead O’Conner (read more about that historical fact here). Unfortunately, it seems as though he forgot to teach Blige the arrangement because she was utterly flat throughout there entire performance.

Watch Blige and Prince perform at the iHeartRadio Festival below:

‘Sweet Thing’

‘Nothing Compares 2 U’

Photo by Christopher Polk/Getty Images North America

Thoughts?