Britney afraid for fiance

Britney Spears has beefed up security after the announcement of her engagement to dancer Kevin Federline following a series of weekend death threats.

Her new fiance has reportedly been targeted by fans distraught that Spears is set to wed again - just six months after her whirlwind marriage to Jason Alexander ended in annulment after 50 hours in January.

Sources told American TV show Extra that the pop superstar fears her boyfriend has a stalker.