"So if you're outside my room trying to get another cheap shot of me ... please go f*** yourself," the pop star wrote on Instagram.
Pop star Britney Spears has revealed that she's been experiencing "absolutely horrible" nausea for a month, similar to that she endured when she was pregnant.
The younger Spears sibling has said that her memoir "Things I Should Have Said" is "not about" her sister.
In an interview on the "Call Her Daddy" podcast, Jamie Lynn Spears discussed efforts she says she made to help free her sister from her conservatorship.
Britney Spears' war of words with her younger sister, Jamie Lynn Spears, showed no sign of stopping on Wednesday, when she shared a furious Instagram post.
"We don't think a father who loves his daughter would file to unseal her medical records," Britney Spears' lawyer Mathew Rosengart said in court.
Britney Spears' lawyer has filed documents in court, which expand on allegations that her father, Jamie Spears, surveilled her without her knowledge.
Judge Brenda Penny refused to allow funds from the singer's conservatorship to be allocated for her father, Jamie Spears, to pay his legal fees.
The two siblings' vicious war of words continues as Britney issued a cease and desist, and Jamie Lynn appeared on the "Call Her Daddy" podcast.
Pop star Britney Spears has sent her sister, Jamie Lynn Spears, a cease and desist letter, while she continues to battle with dad Jamie Spears over her money.
In the fallout of Jamie Lynn Spears' new memoir, "Things I Should Have Said," Britney Spears has some choice words for her and their mother, Lynne Spears.
The "Zoey 101" star continues to face severe public criticism as her vicious spat with her elder sister Britney Spears continues.
"Now looking back, like what a weird f****** thing to do," Jamie Lynn Spears said of her big sister's purported incentive for their parents' marriage to end.
The book is set to feature Jamie Lynn Spears "opening up for the first time, telling her unfiltered story on her own terms."
"I'm happy to share how many times I've reached out to you, supported you and tried to help you," Jamie Lynn wrote on Instagram.
Britney Spears made another post on Twitter following her younger sister's interview on "Good Morning America."
The Spears sisters are currently locked in a social media feud, but the relationship between Jamie Lynn and Britney Spears was "Stronger" in the past.
Britney Spears and her younger sister, Jamie Lynn Spears, are locked in a war of words over claims made in the new memoir "Things I Should Have Said."
Britney Spears hit back at claims by her sister that her behavior had been "out of control" and said Jamie Lynn had "never had to work for anything."
"I hate to burst my sister's bubble, but my book is not about her," said Jamie Lynn Spears in an Instagram statement. "I can't help I was born a Spears too."
Pop star Britney Spears' strained relationship with her family was on display as little sister, Jamie Lynn Spears, gave an interview to promote her memoir.
Britney Spears had slammed her younger sister for performing some of her songs at the 2017 Radio Disney Music Awards.
"I felt like she was another momma," Jamie Lynn Spears told ABC's Juju Chang.
The younger Spears sibling, 30, sat down with Juju Chang for an interview about her upcoming memoir and her family.
Britney Spears' younger sister Jamie Lynn is releasing her tell-all book but it appears to be causing friction between the sisters.
A tearful Jamie Lynn Spears has spoken out about her rift with older sister Britney Spears in a new interview to promote her book, "Things I Should Have Said."
The singer's younger sister is set to appear with Juju Chang on Wednesday morning to discuss her new memoir.
"Free woman energy has never felt better," she captioned the photo.
In a lengthy Instagram post, the 40-year-old pop star offered details about her embattled family life.
The "Toxic" singer's lawyer, Mathew Rosengart, called the request an "abomination," while Jamie Spears maintains he always acted in Britney's best interests.