The xx have beaten 11 other music acts to win the 2010 Barclaycard Mercury Prize.
The annual event, which celebrates the best in UK music, was organised last night at the Grosvenor House Hotel in London.
It is part of Barclaycard’s wider music sponsorship strategy and allows its customers to get preferential access to music events.
Ollie Sim, guitarist of The xx, said: “It’s a bit like a haze to us, being here has been a weird moment of clarity.
“It just means so much.”
The Barclaycard Mercury Prize is an annual celebration recognising UK Albums of the Year.
Last year saw Speech Debelle’s “Speech Therapy” beating the likes of Kasabian, Florence + the Machine and La Roux to the prestigious prize.
Previous winners include Elbow, Arctic Monkeys and Dizzee Rascal.
Barclaycard’s sponsorship has also seen the introduction of initiatives including the monthly Barclaycard Mercury Prize Sessions which have so far included Ladyhawke, Mr Hudson, and Noah and the Whale performing at The Hospital Club in London’s Covent Garden.