Britney Spears and Kevin Federline's son Jayden was spotted out in Los Angeles on Tuesday after his parents clashed over the explosive claims in Kevin's new memoir.

In You Thought You Knew, released Tuesday, 47-year-old former dancer Kevin recounts several episodes in which he alleges Britney, 43, acted erratically around their sons Sean Preston, 20, and Jayden, 19.

Kevin, who was married to the Toxic singer from 2004 to 2007, claims Britney 'punched' Preston in the face, knowingly gave Jayden shellfish despite his allergy, and at one point wished both children 'dead.'

He also alleges that Britney reportedly watched her children sleep while standing outside their room holding a 'knife in her hand' and used cocaine while breastfeeding.

A representative for Britney has denied all claims, with the singer accusing Kevin of 'gaslighting' her and firing back at the allegations, writing on social media, 'I 100 percent beg to differ.'

Amid the ongoing drama and his parents' public feud, Jayden appeared deep in thought as he stepped out of Erewhon Market in Calabasas, looking noticeably downcast.

Britney Spears and Kevin Federline 's son Jayden was spotted out in Los Angeles on Tuesday after his parents clashed over the explosive claims in Kevin's new memoir

Amid the ongoing drama and his parents' public feud, Jayden appeared deep in thought as he stepped out of Erewhon Market in Calabasas, looking noticeably downcast

Dressed in a casual gray T-shirt and matching pants, the teenager wore a serious expression as he strolled with a smoothie in hand.

It was a rare California outing for Jayden, who, along with his brother and father, recently moved to Hawaii and now spends most of his time there.

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The outing comes after Spears's 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 spokesman said. 'All she cares about are her kids, Sean Preston and Jayden James, and their well-being during this sensationalism.'

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

Federline writes in the book 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's heated X message, she accused Federline of harboring hatred toward her.

He also alleges that Britney reportedly watched her children sleep while standing outside their room holding a 'knife in her hand' and used cocaine while breastfeeding

'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.'

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 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.'

The outing comes after Spears's representatives told the Daily Mail that Federline and others are 'profiting off her,' noting that child support arrangements with Federline had already concluded; (pictured 2013)

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

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.'

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

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.'

Jayden Federline emerges as Britney and Kevin go to war over memoir