Elton and Mary J. Blige to duet at his Oscar party...

Mary J. Blige will join Elton John onstage for a duet at John's AIDS Foundation party Sunday after the Oscars.

John's annual Oscar party has raised more than $15 million over the past 15 years. Blige's AIDS-awareness efforts date to 2000, when she worked with MAC Cosmetics on its Viva Glam fund-raising campaign.

The "queen of hip-hop soul" has worked with John previously. He played piano on her single "Deep Inside." No word yet on what song the two will perform at the Oscar party.