Britney Spears reportedly begged now estranged husband Kevin Federline to let another woman join them in bed during their marriage.

A source close to Federline told the Sun, Kevin is “prepared to reveal everything in court” in order to help him secure custody of the former couple’s two sons, Sean and Jayden.

The source claims: “Britney has told him more than once she is sexually attracted to women and men equally.”

“She has asked Kevin many times if they could have a threesome.”

The source didn’t add whether Kevin, who is rumoured to have slept with prostitutes and strippers during their two year marriage, granted her requests.