Britney Spears blasts people who 'profit off my pain' as excerpts of ex-husband Kevin Federline's memoir are released YahooBritney Spears' Ex-Husband Jason Alexander Shares Fiery Message About Kevin Federline's Book E! OnlineWhat Britney Spears and Kevin Federline's teenage sons think of dad's bombshell memoir Page SixKevin Federline Claims Britney Spears Drank Pregnant, Did Cocaine Breastfeeding People.com