Britney Spears' lawyer accuses Kevin Federline of posting video, warns of 'legal issues'

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Matthew Rosengart warned that Federline's latest Instagram posts

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could potentially violate cyber-harassment and cyber-bullying laws.

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Britney Spears' lawyer is speaking out about her ex-husband Kevin

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Federline, warning that the former dancer has created

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"lawful difficulty for himself" with his new open assertions and

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Instagram posts about the pop star and their two kids.

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In a statement shared with Billboard, attorney Matthew Rosengart

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who famously represented Spears in a successful fight to end her

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legal custody -- said Federline's recent actions were "disgusting" and

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"violated the privacy and dignity of the mother of his children."