The 26-year-old 'Born This Way' singer, who was a big fan of the couturier's work, gave the charity auction a boost by outbidding rivals to buy a dress for a record-breaking USD 136,400, reported Daily Mail online.
It was fashion icon Daphne Guinness, who put a huge collection of her haute couture wardrobe up for bidding at Christie's including several items by the late designer.
Gaga is now the proud owner of a 2008 ivory silk gown, called 'The Girl Who Lived In The Tree'.
Guinness sent out a special thank you message to the singer for her huge purchase.
I'm overwhelmed by how many bidders took part ... And I'm particularly moved by Lady Gaga's support for the foundation. I like her very much, and it's lovely to see the nascent beginnings of something that may help other people," she said.
The auction raised USD 747,200 for the Isabella Blow Foundation, set up in memory of the late fashion guru.
