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TMZ reports that the troubled pop princess has entered an unidentified facility for what could be a 35 to 40-day stay.
As a result a planned emergency family law court hearing called by Spears' estranged husband Kevin Federline has been cancelled.
Spears entered a rehabilitation clinic in Antigua last week before checking out after just 24 hours. On Wednesday she checked into a rehabilitation clinic in the US, believed to be the Promises Centre in Malibu, before checking out after just 24 hours once again.
