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29 June 2012, 11:41 | Updated: 29 June 2012, 11:54
The 'Born This Way' star says she feels "honoured" to support the auction in New York.
Lady Gaga has paid more than £85,000 for an Alexander McQueen dress at a charity auction featuring some of the late fashion designer's clothes
The 'Born This Way' star was a close friend of McQueen and said she felt "honoured" to be able to support the benfactor Isabella Blow Foundation.
The auction of items from heiress Daphne Guinness' wardrobe raised a total of £476,800 – more than four times the £100,000 estimate.
Lady Gaga is believed to have paid by telephone for the Alexander McQueen ivory silk tulle empire line gown.
In a message on Twitter, the singer wrote: "I am a passionate fashion collector & feel honored to support The Isabella Blow Foundation.
"Daphne Guinness is a pioneer for artistic women. The auction, in conjunction with Isabella's foundation, felt like fashion's Super Bowl, and my home team was winning for the first time."
Lady Gaga is currently in Australia on the latest leg of her 'Born This Way Ball' world tour, which is scheduled to arrive in Europe later this year.