Kevin Federline has made serious accusations against his ex-wife Britney Spears in his upcoming memoir, “You Thought You Knew.” He claims the pop icon exhibited reckless behavior towards their children.

The 47-year-old former dancer recounts several incidents where he alleges Spears, 43, acted erratically around their sons, Sean Preston, now 20, and Jayden James, now 19. Among the accusations, he claims she watched them sleep from outside their bedroom while holding a knife and used cocaine during the period she was breastfeeding.

Spears has denied the knife allegation on social media platform X, accusing Federline of trying to manipulate her, and she responded to the cocaine claim by stating, “I 100 percent beg to differ.”

Additional excerpts from the memoir, due for release on October 21, reveal Federline’s claim that Preston reported Spears “punched him in the face,” as covered by Variety.

Federline also alleges that Spears bleached their children’s hair, causing scalp burns; forced Preston to bathe with her when he was 10 or 11; knowingly gave Jayden shellfish despite his allergy; and once expressed a wish for their sons to be “dead.”

A representative for Spears has denied all claims after being contacted by the Daily Mail. 

Kevin Federline has leveled serious allegations against his ex-wife Britney Spears in his forthcoming memoir You Thought You Knew, claiming the pop star engaged in physical and reckless behavior toward their children; (Kevin and Britney pictured 2006)

Federline and Spears were married from 2004 to 2007 and share two sons, Sean Preston, 20, and Jayden James, 19; (Preston, Britney and Jayden pictured 2018)

Spears’ representatives told the Daily Mail that Federline and others are ‘profiting off her,’ noting that child support arrangements with Federline had already concluded.

‘With news from Kevin’s book breaking, once again he and others are profiting off her and sadly it comes after child support has ended with Kevin,’ the rep said. ‘All she cares about are her kids, Sean Preston and Jayden James, and their well-being during this sensationalism.’

Daily Mail has not received a response to its request for comment from reps for Federline. 

In the shocking claim that Spears wished harm on her family, Federline writes in You Thought You Knew that Preston received a call from Spears while on a European vacation, during which she allegedly blamed Federline for ‘everything.’

After Preston confronted her, Federline recalls, ‘Her response was chilling: she told him she wished he, his brother, and me were all dead.’

Meanwhile, in Spears’ heated X message, she accused Federline of harboring hatred toward her. 

‘Why is HE SO ANGRY,’ she wrote, adding, ‘The boy hates me and it is deep anger to literally say the things he is saying.’

The Toxic singer continued, ‘If you really love someone then you don’t help them by humiliating them,’ and described Federline’s behavior as ‘way worse than anyone could imagine.’

In a separate post, she called the ‘constant gaslighting from [her] ex-husband… extremely hurtful and exhausting.’

Federline details several episodes in which he alleges Spears, 43, behaved erratically around their sons, Sean Preston, 20, and Jayden James, 19 — including reportedly watching them sleep while standing outside their room in a doorway with a ‘knife in her hand’ – seen 2013

Federline also alleges that Preston told him Spears punched him in the face

Spears also said she has felt ‘demoralized’ about the fractured relationship with her boys, writing, ‘I have always pleaded and screamed to have a life with my boys.’

The singer claimed that she’s seen one of her sons for only ’45 minutes in the past 5 years.’ 

She wrote, ‘Relationships with teenage boys is complex. I have felt demoralized by this situation and have always asked and almost begged for them to be a part of my life.’ 

‘Sadly, they have always witnessed the lack of respect shown by own [sic] father for me,’ Spears went on.

‘They need to take responsibility for themselves,’ she added.

‘With one son only seeing me for 45 min in the past 5 years and the other with only 4 visits in the past 5 years. I have pride too. From now on I will let them know when I am available.’ 

Spears continued, adding that she is the one who ‘gets hurt’ from the ‘white lies’ in Federline’s tell-all book. 

‘Trust me, those white lies in that book, they are going straight to the bank and I am the only one who genuinely gets hurt here.’

Federline also asserts that Spears knowingly gave Jayden shellfish despite his allergy; (pictured in 2004)

The Baby One More Time singer concluded her statement with expressing love for her two boys.

‘I will always love them and if you really know me, you won’t pay attention to the tabloids of my mental health and drinking.’

‘I am actually a pretty intelligent woman who has been trying to live a sacred and private life the past 5 years. I speak on this because I have had enough and any real woman would do the same.’

A source close to Spears also indicated she does not intend to publicly respond to the memoir to maintain a semblance of normalcy for her children.

Federline recounts in the memoir that although he has not spoken to Spears in years, he feels ‘an increasing urgency that I can’t ignore’ and fears that her behavior is ‘racing toward something irreversible.’ 

He writes, ‘The signs are all there: the erratic behavior, the isolation, the cycling of people around her, the refusal to accept help. It’s become impossible to pretend everything’s okay.’

He adds, ‘From where I sit, the clock is ticking, and we’re getting close to the eleventh hour. Something bad is going to happen if things don’t change, and my biggest fear is that our sons will be left holding pieces. 

‘They love their mom. They’ve seen the red flags. But they don’t know how to help without being attacked, misunderstood, or blamed.’