Kara DioGuardi, who also worked on "Heaven on Earth", co-produced and co-wrote "Ooh Ooh Baby" with Spears while she was pregnant with her second child. DioGuardi said that Spears "worked really hard" and called her "unstoppable". In September 2006, Rotem told MTV News that he and Spears were trying to innovate the current sound of radio at the moment, exemplifying Nelly Furtado's "Promiscuous". On November 8, 2006, the day after she filed for divorce from Federline, Spears recorded "Radar" with Ezekiel Lewis and Patrick M. Smith of The Clutch at Sony Music Studios in New York City. Lewis had wanted to work with her for a long time and was motivated to produce something for her that was going to "help her project become a great project to come back with". Smith stated that the team tried to create a record "for the Britney Spears that we know and love" and that it did not "touch on anything that was really dealing with all the stuff that she was dealing with." Both commented that although Spears arrived late to the recording sessions, she caught them off guard with her efficiency and professionalism, with Lewis adding, "It was absolutely nuts, and she took directions very well. [...] I don't know what I was expecting because we went in to cut that record the day after she filed divorce from Kevin ."