Britney Spears says she will sue her sister Jamie Lynn, if she continues to make “derogatory” statements about her while promoting a new book. In a cease and desist letter, Britney’s lawyer Matthew Rosengart claims that the “ill-timed” memoir contains several “misleading or outrageous claims”. Although Britney has not read the book, she believes her sister has “exploited her for monetary gain,” he said. “She will not tolerate it, nor should she,” the letter continued. Jamie Lynn has not yet publicly commented on the letter. “Publicly airing false or fantastical grievances is wrong, especially when designed to sell books. It is also potentially unlawful and defamatory,” Rosengart warns in the letter. “You recently reportedly stated that the book was ‘not about her.’ She takes you at your word and we, therefore, demand that you cease and desist from referencing Britney derogatorily during your promotional campaign.(BBC)…[+]