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Chris Brown will be joining Mary J. Blige, Natalie Cole, Sister Sledge, Akon, Angela Bassett and MJ's own band and dancers for another tribute concert slated for Sept. 26th in Vienna, says Michael's brother Jermaine.

The show, which will feature performers from around the world covering Jackson's hits like "Bad," "Billie Jean" and "Thriller," will take place at a 17th-century palace in the Austrian city.

And although she hasn't yet been confirmed, organizers are hoping that Madonna may even make an appearance onstage to honor her late friend.

Although with what appears to be a bum ankle left over from her Sticky & Sweet tour that just wrapped, I guess we won't expect to see her moonwalk!