Though the rift between Lynne and Britney Spears had been growing for quite some time, it was Lynne’s relationship with Kevin Federline’s first ex, Shar Jackson, that pushed things over the edge. While Britney, 25, was at Promises Treatment Center following her dramatic head-shaving incident, Lynne was getting to know “the other woman.”  (Wouldn’t Britney be the “other woman”, not Shar?)

It all started when Lynne dropped grandsons Sean, 21 months, and Jayden, 9 months, at father Federline’s house. Shar, 30, who also has two children with Federline, 29, was there as well, and ended up watching Spears’ sons. After meeting, Lynne and Shar “started talking all the time,” a Jackson source tells Us. Spears was enraged. “She decided she had to cut out everyone who was using her, and that included her parents,” says a source.

Jackson confirmed the friendship for Us yesterday, saying, Lynne is “a really nice lady… It was easy for us to get along once we met.” She also thinks it’s time for Lynne and Brit to “work it out. They are mother and daughter. They need to talk already.”

To read more about Britney and Lynne’s road to reconciliation, and the events that led to their estrangement, check out the new issue of Us Weekly, on newsstands this week.

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