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We just caught Britney driving all the way up to Valencia, about 30 minutes north of Los Angeles, where she surprised her mom on the set of sis Jamie Lynn's TV show with legal papers related to a restraining order. As X17online has exclusively reported, Britney is seeking a restraining order against her own mother to keep her mom from visiting with Britney's two sons Sean and Jayden. The reason? -- alleged pain medication abuse by her mom.

A source has told X17 that Britney's motivation behind this is to stop Britney's mom from seeing the kids at Kevin's house, where Lynne and Kevin colluded together previously, to threaten Britney's custody of the kids if she didn't go to rehab.

Here's the kicker ... our source says that Britney's own mother, her estranged husband Kevin Federline, and her former manager Larry Rudolph were instrumental in forcing Britney into treatment at Promises rehab in Malibu in February but that a drug test at the time of Britney's admission into the center, turned up negative and proved that her system was totally clean of any drugs.