In February 2011, Spears confirmed that her seventh studio album, Femme Fatale, would be released on March 29, 2011. Max Martin and Dr. Luke executive produced the album, with Luke stating that he wanted the sound to "get harder in some ways […] and maybe a little more deep into electronic. Max Martin, Dr. Luke, Bloodshy & Avant, Shellback, Benny Blanco, will.i.am, Fraser T. Smith, Stargate, and Darkchild all produced songs on the album. Its lead single, "Hold It Against Me," was released on January 11, 2011, and debuted at number-one on the Billboard Hot 100. This gave Spears her fourth number-one single on the chart, and made her only the second artist in history to have two consecutive singles debut at number-one, after Mariah Carey. A second single, "Till the World Ends," was released on March 4, 2011.