Federline back with ex?

Britney Spears fears her estranged husband Kevin Federline has rekindled his romance with his former love, actress Shar Jackson.

K Fed was a dancer when he and Britney hooked up. Ex-Moesha star Jackson was pregnant with his second child att he time, in 2004.

But Federline, who recently agreed a divorce deal with Spears, has been spending more time with Jackson of late, sparking reports they're reconciling - despite previous claims in February that they will not be getting back together.

A source tells America's In Touch Weekly: "Shar was always there for Kevin. When things were really bad with Britney, she was a rock for him."

One of Federline's pals says it's only a matter of time before the couple reunite, adding: "Shar was his first love - plus, he's been saying how hot she looks."