The singer tweeted that she had bought 55 pieces in the sale administered by Julien's Auctions in Los Angeles and said she plans to keep the items "archived and expertly cared for in the spirit and love of Michael Jackson, his bravery and fans worldwide".
Auctioneer Darren Julien said the jacket Jackson wore during his Bad tour fetched 240,000 US dollars (£150,000). Two of the King of Pop's crystal-encrusted gloves sold for more than 100,000 US dollars (£62,500) each, as did other jackets and performance costumes.
The auction featuring the collection of Jackson's long-time costume designers Dennis Tompkins and Michael Bush raised more than five million US dollars (£3.1 million). Some proceeds benefited Guide Dogs of America and the Nathan Adelson Hospice of Las Vegas.