TMZ has learned Mariah has ordered Kenneth Bordewick, her interior designer, to bid on an ornate living room set owned by Michael at Julien's Auctions, which will be held tomorrow in Vegas.
Michael bought the furniture to fill the London mansion he was supposed to live in during the run of the "This Is It" tour.
According to the auction house, the living room set -- which MJ bought for $200,000 -- could fetch $1 million. The open bid -- $150,000. The proceeds -- minus commissions -- will go to Jackson's estate.
You gotta believe Mariah will put old lady plastic covers on the furniture, in case Nick has an accident.