Celebrity tattles report that the wedge between Lynne and Britney Spears was driven to “Toxic” territory when Mom befriended Brit’s bitter rival, star of “The Ex-Wives Club,” Shar Jackson.

The trouble started when Lynne dropped Federline Toodler Heartbreakers Sean and Jayden over a K-Fed’s house and met thirty year old actress Shar. After meeting, Lynne and Shar “started talking all the time,” a Shar mole tells the gossip rag. Britney was livid. “She decided she had to cut out everyone who was using her, and that included her parents,” says a source.