Shame, shame, a thousand times, shame on any parent who uses their child or children as a pawn/tool of manipulation. That means you, Britney 'mother of all train wrecks of a mother.'

PageSix.com reports that the bitter tart refused to let her sons, Sean Preston, 2, and Jayden James, 1, open Christmas presents given to them by their grandparents.

“Britney would not let her boys open the gifts from her mom and dad,” a family insider said. “Apparently she hid them, and she told [her ex-husband] Kevin [Federline] she might send them back to her parents un-opened.”

Lynne and Jamie Spears are apparently being punished by their daughter for 'forcing' her into rehab last year. Lynne Spears' decision to keep Britney out of the loop regarding her sister's pregnancy probably tipped Brit over the edge….wait a minute, she can't fall any farther, can she?

To her ex's credit, K-Fed reportedly chewed Britney out over the phone for her characteristically selfish behavior. “Kevin told her to stop acting like a spoiled brat,” the insider added. “He asked her to give them to him and he would let them open them.”