For the second time in under a week, Britney Spears has checked into a California rehab facility according to a paparazzi agency.An agency told Access Hollywood their snappers spotted the pop singer returning to Malibu treatment center Promises under the cloak of darkness last night.Earlier this week Spears checked into the same rehab and left the next day."She hasn't been reasonable in a good while," a source close to the singer told Access Hollywood. Britney has been drinking and partying and she has suffered from years of "instabilities," the source added.While Britney tends to her health, last night Spears' soon to be ex-husband Kevin Federline and his lawyers called an emergency hearing in family court. The hearing was cancelled this morning based on news that Britney returned to rehab.Federline has been looking after his two children with Spears, Sean Preston and Jayden James since last Thursday, a source close to Brit's ex confirmed to Access.
/ Source: Access Hollywood