Jamie Lynn Spears in the middle of Britney's battle with their mother

Britney Spears's feud with her mother Lynne is getting pretty ugly. The popstar has dragged her younger sister into the mess and is trying to bring the young "Zoey 101" actress over to her side.

Britney recently presented her mother with a letter asking that she stay away from Britney's two sons. Britney feels that her mother betrayed her by sending her to rehab even though she did not have a substance abuse problem. Adding to the tension is the fact that Lynne has become close with Britney's ex, Kevin Federline and has even gone through Kevin in order to see her grandkids. The Gossip Girls website quotes an insider as saying, "Britney said that Jamie Lynn needs to know what her mother is doing to her. She wants her sister to be on her side."

In an attempt to win over Jamie Lynn, Britney has changed her will, having all of her assets go to Jamie Lynn instead of Lynne. The source said, "By leaving Jamie Lynn everything in her will, Britney is using her money to pit her sister against her mom. Jamie Lynn loves both her mom and her sister - and she doesn't know what to do."