Susan Boyle's debut album "I Dreamed a Dream" (Syco/Sony Music Entertainment) is set to be the biggest U.K. seller of 2009, according to the Official Charts Company (OCC).

Although it will only have five weeks of sales this year, that will likely be enough to make it the top-selling album. The Boyle set had moved 1.34 million up to the end of Dec. 19, taking it past the 1.19 million sales in 2009 for Lady Gaga's "The Fame" (Interscope).

Kings of Leon's "Only By The Night" (Hand Me Down/Sony Music Entertainment) - released back in September 2008 - is currently the third biggest seller of the year having racked up 65 weeks on the U.K. chart. It is followed by Michael Buble's "Crazy Love" (Reprise/Warner) and Black Eyed Peas' "The E.N.D." according to the OCC.

"In just four weeks, Susan Boyle has become the biggest album artist in the U.K. by some margin - an extraordinary achievement for an artist who was totally unknown until last April," said Martin Talbot, managing director of the OCC, in a statement. "She has clearly connected with a massive proportion of the British population and is now looking solidly in place to take the title of the biggest album of the year."