Britney Spears and Kevin Federline have been facing off in court over demands for additional child support.

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According to TMZ, Federline currently receives $25,000 per month in support for his two children with Spears, but wants the amount raised.

Lawyers for both parents squared off in a contentious court appearance on Friday, with Spears’ team reportedly wanting to understand exactly what Federline needs the extra money for.

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Federline’s team, meanwhile, have demanded the right to examine in detail Spears’ earnings and expenditures.