Federline fears Britney could kill herself

Britney Spears' ex-husband has expressed fears that the singer could kill herself, according to a report.

The News of the World claims that Kevin Federline confided in his girlfriend Nicole Narain, who has given an interview to the newspaper.

Federline is currently battling Spears for custody of their two sons, Sean Preston and Jayden James.

"Britney's behaviour has already put our kids at risk and I can't let things get any worse," Kevin explained. "She's lost all grasp on reality and is dragging the children through hell. Her mood swings are now so wild that I live in fear of getting a call telling me that she has killed herself.

"I can't allow her to have custody because I seriously believe she could harm our sons. I've shared her life and I know she's capable of anything with pills and a few drinks inside her."

Nicole added: "Kevin is battling for his kids as he genuinely fears they are at risk. He never shouts and screams about Britney in front of me. He does speak openly about his concerns for his children though."