Kesha - TiK ToK

Release date: 2009

This was the world's biggest selling digital single in 2010. Kesha's pop-rap track sold 12.8 million copies, well ahead of Lady Gaga's runner-up "Poker Face," which was downloaded 9.8 million times.

American actor Simon Rex, who played George Logan in Scary Movies 3 & 4, appears as a character named Barry in the song's music video.

Album: Animal