Troubled pop star Britney Spears was facing a probe into allegations Wednesday that she abused her two young sons, The Sun reported.

Social workers were set to quiz her over claims she beat one with a belt and gave both food they were allergic to and which made them violently ill.

The singer's former bodyguard Fernando Flores, who claimed he was forced to quit his job due to Britney's erratic behavior, approached investigators with the accusations.

It is understood that the 28-year-old star strongly denied the claims and insisted she has never mistreated four-year-old Sean Preston and Jayden James, three.

But Flores, 29, told the Los Angeles Department of Children and Family Services he felt Britney was too unstable to be left in charge of her sons.

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He feared her behavior could scar the youngsters for life. The children split their time between Toxic singer Britney's Beverly Hills mansion and dad Kevin Federline’s home.