25 most downloaded songs ever

13. Katy Perry, ‘I Kissed A Girl’. Perry’s breakthrough hit was co-written by Swedish songwriter Max Martin (who also wrote another song in the Top 25, Pink’s ‘So What’) – with a little help from Cathy Dennis, the brains behind such tracks as ‘Can’t Get You Out Of My Head’ and ‘Toxic’. Photo: PA Photos

  • Photo: Pa Photos
  • Added: Feb 15, 2010

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