Kevin Federline claims Britney Spears used cocaine while breastfeeding

Kevin Federline has dropped another bombshell Britneyin his own way…claiming that she used cocaine while still breastfeeding.

In an excerpt from his new tell-all, “You Thought You Knew,” obtained by VarietyFederline remembers walking in on her, witnessing coke use and getting into a huge fight that led to their divorce.

He claims she would be home with their sons Sean Preston And Jayden Jamesbut showed up at his 2006 release party for “Playing With Fire”.

“When we reached the top [of the venue]Jamie Spears, Britney’s father, was there,” Federline wrote. “I didn’t expect to see him, so I was glad he decided to come and support me. He glanced my way, shook his head, and gestured toward the door of my dressing room. His expression was in that flat empty space between disapproval and concern, as if to say, “She’s here, and it’s not good.”

He continues: “The first thing I saw was Britney and her young girlfriend snorting a thick line of Coke from the table,” Federline claims. “Both wore these outrageous wigs. Britney’s was electric blue. It was surreal. They didn’t even try to hide it.”

K-Fed was on “TMZ Live” on Wednesday and talked about other issues in their marriage, including a secret phone call she made to her ex, Justin Timberlakethe night before the wedding.