The actress planning to get her own back on ex-husband Peter Facinelli by ripping him apart in a tell-all book.

Sources say Garth ill bare intimate and embarrassing secrets in her upcoming memoir, Deep Thoughts from a Hollywood Blonde.

“Jennie is out for blood,” disclosed an insider.

“She’s telling friends that she’s going to reveal the real story of why her marriage failed, and that Peter is not going to come out looking good.”

Jennie and Peter — parents of daughters Luca, 16, Lola, 11, and Fiona, 7 — married in 2001, and split in 2012, amid rumors that The Twilight Saga actor had cheated.

“Peter begged Jennie to leave out any references that made him look like a cad or painted him in a bad light,” divulged the source.

“But Jennie told him that he should have thought about that when he was running around on her.”

The pair finalized their divorce in June.

“It’s obvious Jennie still has an ax to grind with Peter,” said the source, “and this book is definitely going to tear open old wounds between them.”