If JAMIE LYNN SPEARS can spill all her family tea in a book, so can BRITNEY.  And she can make a lot more money doing it.

Britney has reportedly signed a $15 MILLION deal to write a tell-all.  Although it’ll be interesting to see if she actually tells all given how upset she was with her sister for airing all their dirty laundry in public.

Jamie Lynn’s book, “Things I Should Have Said”, quickly dropped to #95 on Amazon’s bestseller list, due to condemnation from Britney and all her fans.

Britney also served her sister with a cease-and-desist to make her stop talking about her in public.