BRITNEY Spears lambasted sister Jamie Lynn Spears as "scum" and accused her of "lying" as her sibling's tell-all book was declared a national best seller.
The Baby One More Time popstar, 40, took to her Instagram account to let rip on her younger sister, who recently released memoir Things I Should Have Said.
The pair have become embroiled in a feud since news of the book broke, with Brit threatening to sue Jamie Lynn for derogatory claims before branding her a "brat" for her new tome.
In the latest war of words, mom of two Britney uploaded two clips from TV shows The Talk and The Real, both of which featured panels which took her side, They argued Jamie Lynn's words would have been best said in private rather than plastered over the new release.
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