Britney Spears fears her estranged husband Kevin Federline has rekindled his romance with his former love, actress Shar Jackson. The pop princess lured the dancer away from Jackson while the ex-Moesha star was pregnant with his second child in 2004. But Federline, who recently (Mar07) agreed a divorce deal with Spears, has been spending more time with Jackson of late, sparking reports they're reconciling - despite previous denials in February (07) 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." Jackson went under the knife last year (06), spending $15,000 (GBP7,700) on a tummy tuck and breast lift.