Katherine Jackson at the Michael Forever concert held at The Cardiff Millennium Stadium in Wales, (Oct. 8, 2011)

*Michael Jackson’s mother Katherine is “extremely displeased” by reports which claim crew members who worked on the King Of Pop’s tribute concert last month have not been paid in full.

Staffers at the October 8th “Michael Forever” concert event in Wales have taken to Twitter to accuse organizers at Global Live of failing to compensate them for their work.

Katherine Jackson attends a live press conference announcing Global Live Evennts' International Historical Trubute Concert honoring the late pop icon Michael Jackson on July 25, 2011 in Beverly Hills

Mrs. Jackson, who supported organizers of the show, is reportedly upset to hear about the complaints and hopes the situation will be rectified.

A lawyer for the Jackson matriarch tells TMZ, “After Mrs. Jackson did all she could to help promote and make this a great event for all of Michael’s fans, she is extremely displeased to hear that concert promoters have allegedly failed to pay their bills. Katherine is hoping that they step up and take care of their obligations.”