"Till the World Ends" (stylized as till the world ends) is a song by American recording artist Britney Spears. It was released as the second single from her seventh studio album, Femme Fatale. "Till the World Ends" was leaked on March 3, 2011, and was released for digital download the following day."Till the World Ends" received mostly positive reviews, with critics calling it a catchy dance track and complimenting its anthemic nature.