Spears 'unravelled after meeting K-Fed'

Britney Spears’s troubles began when she started dating Kevin Federline, a TV doctor has claimed.

Dr. Drew Pinsky said the singer's highly-publicised meltdown can be traced back to the start of her relationship with her ex-husband.

He told E!’s True Hollywood Story: "If you take Britney's life and put a moment in time where things started getting bad, it's the moment she got involved with Kevin Federline.

"That's when things started to unravel."

Pinsky is the host of VH1 show Celebrity Rehab With Dr. Drew.

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