Jamie Lynn Spears hits back at sister Britney Spears, claims 'accusatory posts' have led to threats against her family

Jamie Lynn Spears has hit back at her big sister Britney Spears in a statement shared to Instagram this afternoon.

Earlier today, Britney, 40, responded to Jamie Lynn's recent ABC News interview, in which the 30-year-old defended her role in the singer's 13-year conservatorship.

Britney took issue with Jamie Lynn calling some of her behaviour "erratic" and suggested her younger sister "wants to sell a book" at her expense.

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Now, Jamie Lynn, who is in the middle of promoting her new memoir Things I Should Have Said, has rejected this claim and says there is more going on behind the scenes than what Britney is saying.

"Brit, I am always here," Jamie Lynn wrote. "It's become exhausting when conversations, and texts we have in private don't match what you post on social media. I know you're going through a lot and I never want to diminish that, but I also can't diminish myself."

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Jamie Lynn said her family is getting death threats "as a result of their aunt's vague and accusatory posts." Jamie Lynn is mum to Maddie Briann, 13, and Ivey Joan, three.

"I hate to burst my sister's bubble, but my book is not about her," Jamie Lynn continued. "I can't help that I was born a Spears too, and that some of my experiences involve my sister. I've worked hard since before I was even a teenager, and I've built my career in spite of just being someone's little sister."