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An X17 source confirms that Britney is set to file papers for a restraining order against her mother Lynne, in an attempt to keep her mom away from her two sons. Our source tells us that the paperwork is completed and that Britney is claiming her mother is abusing prescription pain medication and that she should be kept away from Sean and Jayden. The papers are supposed to be filed today or tomorrow.

Oh, and the supposed "reconciliation" between mom and daughter a couple weeks back, word is, Britney wasn't expecting that visit from her mom and sister and that she was not happy with the surprise.

Stay tuned for more details ...