Trainwreck Britney Spears is at rock bottom after ex-hubby Kevin Federline ripped her to shreds in a bombshell memoir – and RadarOnline.com can reveal loved ones are terrified she'll decide to end it all.

"There are real worries building that Britney is feeling like she has precious little, if nothing left to live for and she could try to take her own life," revealed one worried insider. "Kevin's book is just the latest in a long list of setbacks and disasters she's had to contend with, but the growing worry is this is the one that could push her over the edge." Article continues below advertisement

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His memoir, titled

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