Business is good for this self-proclaimed 'Christmas prostitute.' Michael Buble's holiday set, 'Christmas,' is well on its way to being the second-biggest selling album of 2011.

Buble's 'Christmas' has moved 1.52 million copies, per Billboard, and could move another 450,000 to 500,000 units last week alone, making for his fourth consecutive No. 1 spot on the weekly top 200 chart. Industry prognosticators estimate that Buble will move 2.4 million copies by the year's end.

'Christmas' is already the fourth best selling album of 2011, behind Lil Wayne's 'Tha Carter IV' with 1.8 million, Lady Gaga's 'Born This Way' with 2 million, and Adele's unstoppable '21' taking the top spot with 5 million copies sold. Buble's record is the only holiday album on the list.

Buble's chart performance is a testament not only to the crooner's talent, but also to his marketing strategy. Buble's blitzed both the radio and television airwaves in support of 'Christmas,' with spots on 'Saturday Night Live,' the Rockefeller Center tree lighting ceremony and a holiday variety special on NBC featuring fellow Canadian pop phenom Justin Bieber.