Burke is one of 10 artists to pass a million sales this decade
Alexandra Burke has become the first British female solo artist to sell a million copies of a single in the UK.
The X Factor winner's cover of Hallelujah has been number one for the past three weeks, and was the first chart-topper of 2009.
The track has also become the biggest-selling single for a UK female solo artist in chart history, the Official Chart Company confirmed.
Leona Lewis's debut single, A Moment Like This, sold about 850,000 copies.
Burke, 20, is one of only 10 artists who have sold over a million copies this decade but is still about 100,000 sales short of Kylie Minogue's 2001 hit Can't Get You Out of My Head.
The list also includes (Is This The Way To) Amarillo by Tony Christie and Peter Kay, plus Bob the Builder's Can You Fix It.
The biggest seller is another former reality show contestant, Will Young, who won Pop Idol.
His debut, Anything Is Possible/Evergreen, released in March 2002, sold more than 1.1 million in its first week, making it the fastest-selling UK single in history.