Jermaine Jackson's planned Vienna, Austria tribute to his late brother Michael is in jeopardy after a string of stars denied they'll be playing at the event - Mary J. Blige has turned the show down.

Jermaine Jackson announced Mary J. Blige and Chris Brown would be among the headliners at a press conference on Tuesday (08Sep09), but both have since insisted they won't be part of the 26 September (09) concert at the Imperial Schonbrunn Palace.Chris Brown's spokesperson has said, Chris is not confirmed to perform or participate in any capacity for this show, and now Mary J. Blige's people have followed suit - an aide insists the Family Affair singer will be in Italy and not in Austria on the day of the tribute.Natalie Cole, Akon and Sister Sledge are also on the bill, according to Jermaine.Meanwhile, promoters are trying to play down reports that the King of Pop's brother is staging the Vienna show against his mother Katherine's wishes.Event organiser George Kindel says, She will be there with Michael Jackson' s kids.