"Till The World Ends" was written for Britney Spears by Kesha (Sebert), Dr. Luke, Max Martin and Alexander Kronlund. Kesha sings the demo and makes an appearance on the Britney Spears re-mix hit with Nicki Minaj.

Britney Spears' version of "Till The World Ends" (Alexander Kronlund - Kesha - Max Martin - Lukasz Gottwald) was recorded for the 2011 LP "Femme Fatale". While the album topped the charts, the single was the first track on the release and reached number three on Billboard.