Katy penned both this song and "5AM
" with Robbie Williams collaborator, Guy Chambers. He was suggested to the singer-songwriter as a partner by her publisher. "It was a really good experience," said producer Geeneus to The Observer
. "As soon as Guy saw how much Katy knew, it was really chilled out. I mean, she's got Grade 8 piano or something, so he just let her go."