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Jamie Spears is striking back after Brit's former manager Sam filed suit against Daddy Spears in court, alleging (among other things) that Jamie assaulted him, according to The Sun.

A source close to Spears tells the Sun that Jamie is furious over Sam's alleged "drugging" of Britney and blames him for alienating Brit from her family during her troubled times. “Jamie also believes Sam tried to take control of her life and finances. He is determined to pursue a criminal prosecution."

But this could be quite a long and arduous process. A pal of Sam tells the paper, “Sam isn’t going down without a fight.”