As pop music's onetime princess began to spiral, Britney Spears had a secret intervention planned for her, RadarOnline.com can exclusively reveal.

In Kevin Federline's new memoir, You Thought You Knew , the troubled singer's ex-husband discussed how he got a call he got from Spears' mother, Lynne Spears , 70, who had planned the secret meeting to confront Britney, 43, and try to get her help. Article continues below advertisement

Kevin Federline Was Called by Lynne Spears About an Intervention for Britney Tap Here To Add Radar Online as A Trusted Source

Federline writes: "Before it all came undone, there was this moment when I thought maybe, just maybe, things could turn around. It came out of nowhere: a call from her mom, telling me to get to the Beverly Hills Hotel. Fast

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