Hip-hop group Black Eyed Peas song I Gotta Feeling is the best-selling digital song of all time, according to Nielsen SoundScan.
The track spent 14 weeks at the top of the US music chart and sold 5.56 million digital downloads.
The song beat Flo Rida's Low, which had previously held the record having sold 5.53 million since March 2008.
Boom Boom Pow - another song by Black Eyed Peas - is the fourth best-selling digital song in history.
Lady Gaga's Just Dance is at number three with 5.36 million sales and the pop star's Poker Face rounds off the top five with 5.13 million sales.
In February I Gotta Feeling was officially named the most downloaded track by the ITunes online store.