Britney Spears has had it with her sister talking about her on her book tour.

The singer has sent a cease-and-desist letter to Jamie Lynn spears Tuesday, regarding her new memoir, "Things I should have said."

Britney's lawyer says the book makes outrageous and misleading claims about Britney.

It also accuses Jamie Lynn of using Britney to promote her book.

Jamie Lynn has said the book isn't about her sister, but she does write that Britney’s behavior growing up was "paranoid" and "erratic."

In a recent interview with "Good Morning America," Jamie Lynn said she was her sister's biggest supporter and had nothing to do with the 13-year conservatorship, which ended last year.