Britney Spears britpoolmom.jpg

The NY Post is reporting that Brit's totally pissed off about her mom's impending tell-all tell-all book, but we just saw her chillin' with her mom two weeks ago, poolside in Calabasas!

According to Post sources, Brit is upset about the book, "especially when she feels Lynne herself caused so many of her problems and issues."

It's true, people; I mean, Brit told us way back when that her mom and Larry Rudolph were to blame for her stint in rehab in February 2007, but they've reconciled, for now, and further, reports say Lynne's book ISN'T really a tell-all, but a spiritual guide to mothering :) Yeah, right!

But Brit doesn't have much else to be upset about these days - she won three VMAs last night and she's looking better than ever!