Ex blasts unfaithful Federline

Kevin Federline's first fiancée Kerri Whittington insists she wouldn't be surprised if the troubled rapper strayed during his marriage with Britney Spears.

Whittington, who was with the rapper for three years, insists he could never be faithful during their time together, and believes the constant stories of Federline partying in Las Vegas while he was with the Toxic beauty proves he hasn't changed.