The singer purchased 55 items at an auction selling various pieces of clothing worn by the late King of Pop during his career.
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"The 55 pieces I collected today will be archived & expertly cared for in the spirit & love of Michael Jackson, his bravery, & fans worldwide," GaGa assured followers on Twitter.
The auction - which took place at Julien's Auctions in Beverly Hills, Los Angeles yesterday (December 2) - raised over $5 million in sales, reports The Washington Post.
Among the most sought-after pieces was the jacket Jackson wore during his Bad world tour, which sold for $240,000 (£149,000), and two of his crystal-encrusted gloves, which went for $100,000 (£62,000) each.
Some proceeds from the auction benefited Guide Dogs of America and the Nathan Adelson Hospice of Las Vegas.
Photo gallery - Michael Jackson, the videos:
Jackson's video for 'Beat It' in 1982 set the rules for future videos - elaborate choreography and masses of dancers.
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