The bad blood between Britney Spears and her mother has turned physical.

The troubled pop princess and Lynne Spears had a shocking slapfest in mid-June that left Lynne shaken and Britney more determined than ever to cut her mother out of her life for good, according to Star magazine.

The trouble reportedly began when Lynne Spears stopped by her daughters house with an invitation on the weekend of June 15. Lynne barged into the house and insisted on taking the kids out to spend some private time with them, an insider told the tab. She didnt ask or suggest, she demanded! says the insider. Then she began denigrating Britneys mothering skills and losing her temper at the same time!

It was because of the cat fight that Spears served the legal papers against her mother, but the buzz is that Lynne Spears is mulling a countersuit. But she doesnt completely blame her daughter she believes the Toxic star is suffering from depression.

Despite their problems, Lynne cares deeply for Britney and wants to find a way to help her, a friend told Star.  She thinks antidepressant drugs may be the answer.  Lynne feels Britney has severe depression issues, and they are in large part the cause of her apparent manic behavior and past problems with alcohol.