Britney Spears is speaking out against her ex-husband Kevin Federline .

Over the past few days, excerpts from the 47-year-old former back-up dancer’s forthcoming memoir You Thought You Knew . In his new book, Kevin has claimed the 43-year-old “Gimme More” singer stood silently in their sons’ room at night with a knife in her hand and also claimed that she cheated on him with another woman .

If you didn’t know, Britney and Kevin got married in 2004 before finalizing their divorce in 2007. They share sons Sean Preston , 20, and Jayden James , 19.

Ahead of the release of the memoir, Britney took to social media to slam Kevin for “gaslighting” and “hurting” her with a book full of “white lies.”

“The constant gaslighting from ex-husband is extremely hurtful a

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