additional vocals Max Martin – songwriter Cirkut – songwriter, producer, instrumentation and programming Serban Ghenea – mixing Emily Wright – engineering and vocal production Chris "Tek" O'Ryan – sound engineer Clint Gibbs – assistant engineering John Hanes – mix engineer Phil Seaford – assistant mix engineer Tom Coyne – mastering Charts Weekly charts Year-end charts Certifications Release history See also List of number-one dance singles of 2012 (U.S.) References External links 2011 singles 2011 songs Song recordings produced by Dr. Luke Songs written by Dr. Luke Jessie J songs Songs written by Max Martin Song recordings produced by Cirkut (record producer) Song recordings produced by Max Martin Songs written by Claude Kelly UK Singles Chart number-one singles Number-one singles in Scotland Irish Singles Chart number-one singles Songs written by Jessie J Music videos directed by Ray Kay Songs involved in plagiarism controversies Lava Records singles Universal Republic Records singles