It's sold more than 150,000 copies in just four days and could shift 1.25m by the end of the year.
Nicole duet
And his duet with Nicole Kidman, Somethin' Stupid, is also set for the number one spot.
Hear'Say have so far had the biggest album sales of the year with 750,000 copies sold.
All the songs on Swing When You're Winning are covers of songs from the 1940's and '50's.
