Britney Spears’ legal woes in her ongoing divorce from Kevin Federline may take a turn for the worse now that her former assistant, Alli Sims, has turned to K-Fed to help take the pop princess to court for custody of the kids.After hearing about Britney’s reported breakdown on Perezhilton.com, Kevin spent three hours on Monday, July 23, with his lawyer, Mark Vincent Kaplan, discussing the options to finally get the kids out of Brit’s care.Kevin is worried about Sean and Jayden’s safety,’ an insider close to Kevin confirms to OK! ‘He had heard bits and pieces of what was going on from Brit’s mother, Lynne [Spears] and from the bodyguards but has been trying to focus on getting along with her and didn’t want to believe she had completely lost it.’After Alli stopped working for Britney, she and Lynne reached out to Kevin and gave detailed information about her ongoing erratic behavior. A longtime Britney pal says, ‘Alli gave specific instances where Brit couldn’t handle having the kids. Kevin was angry at Britney for putting his kids in jeopardy and immediately phoned his lawyer to investigate the claims further. He couldn’t believe she had gotten so out of control.’ Brit’s cousin is planning on providing specific instances to help give full- time custody to Kevin and finalize the divorce from Britney.At this time, Kevin’s legal team is redrafting the divorce settlement to include her recent public and private problems and has already contacted Britney’s lawyers to set up a meeting. For more on Britney’s meltdown, pick up the OK! on newsstands later this week.Photo: Wireimage.com

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