After Kevin Federline told wife Britney Spears he had enjoyed a night out clubbing in Los Angeles with former lover Shar Jackson, the singer is terrified he’ll leave her. “Britney is in a rage over Kevin seeing Shar while she flew home to Louisiana,” a source told the National Enquirer. “She’s absolutely livid that Kevin partied with his old flame while she was out of town. Britney is seeing red with Kevin right now. She always seemed very jealous that Kevin’s feelings for Shar still linger on. Britney is also fuming over Kevin spending so much time on his CD project and not with her and Sean.” Read more.