The troubled star's dad finds her naked and sobbing

When Britney Spears held her sister Jamie Lynn’s newborn daughter on 19 June, no one could’ve predicted how much it would shatter her state of mind.

But Now can reveal the secret details of Britney’s terrifying breakdown after seeing her new niece, which has been kept under wraps until now.

Having spent only half an hour with her 17-year-old sister and Maddie in McComb, Mississippi, the troubled 26-year-old cut her trip short and flew back to LA, where she was pictured in floods of tears.

For the next two days, her dad Jamie, 59, who’s staying with his daughter because he’s now in control of all her affairs, became more anxious about Britney’s deteriorating state.

Our source says that she was ‘a bit dazed and distant’, wouldn’t answer any of her dad’s questions and ‘had no enthusiasm for anything’.

He had every reason to be concerned. On 21 June at approximately 9.30pm, Jamie found his daughter naked on the bathroom floor, crying hysterically and mumbling to herself about wanting a baby girl.

Jamie rang the doctor, who rushed to Britney’s side and diagnosed a breakdown.

Our source says: ‘Seeing her little sister give birth was too much for Britney. It made her realise what a mess she’s in. She’s insanely jealous of Jamie Lynn having a girl because she’s always been desperate for a daughter.

‘Jamie found her sobbing her heart out and repeating: “It’s not fair, Dad, it’s not fair.”

‘He sat with her, cuddled her and stroked her hair. Then he got her some clothes and helped her into the bedroom before calling the doctor, who ordered her to rest. They bumped up her Melleril and Ativan because of the drama she was creating.’

See the full story in Now magazine dated 14 July – out now!