Amy Winehouse's second album Back to Black is set to be the biggest-selling album of the year. 
The troubled singer's soul-tinged CD, released at the end of 2006, has now sold more than 1.5m copies in the UK, achieving five platinum sales awards.
Leona Lewis's Spirit and Mika's Life in Cartoon Motion are currently the second and third best selling albums of the year, with just over a week left to go.
Winehouse was recently nominated for six Grammys including song of the year.
The 24-year-old's debut album, Frank, also sold 300,000 copies in the UK this year, despite being released in 2003.
"Amy Winehouse's Back To Black is in pole position to be the year's biggest seller," said Matt Phillips, spokesman for record labels body the BPI.
"But more than 6 million albums were sold last week, and as this weekend is likely to be the biggest of the year for music sales, Leona may close the gap."
Lewis sold 1.27m copies of her album in just five weeks, becoming the fastest-selling debut in UK history and making the former X Factor winner the fastest female million-seller in the UK, according to the BPI.
Spirit was the second album to sell a million copies in 2007, after Back to Black.
Lewis's single Bleeding Love is also the best selling single of 2007 so far, after spending seven weeks at number one in the charts.
Mika's debut album, released in February, has just passed the one million sales mark.