Answer: Cole Porter
"The Gay Divorcee" was based on the stage musical "Gay Divorce", written by Dwight Taylor with songs by Cole Porter, which had opened on Broadway in 1932 starring Fred Astaire and Claire Luce. Following the success of "Flying Down To Rio", Pandro S. Berman, the head of production at RKO, purchased the rights to "Gay Divorce" as a starring vehicle for Astaire and Rogers. The title of the film was altered to "The Gay Divorcee" on advice from the Hays Office, on the grounds that "while a divorcee might be gay or lighthearted, it was 'unseemly' for a divorce itself to be so labelled". Although the film was based on the show, the majority of the songs Cole Porter had written were replaced. The only one of Porter's songs to be retained was "Night and Day", which was used in Astaire and Rogers' first paired dance sequence in the film, which was taken directly from the stage show. This was in spite of Astaire initially requesting that it not be used, as the song had become a massive hit, with the star worried that its use would lead to it becoming overexposed.