Britney Spears has accused her sister Jamie Lynn Spears of trying to "sell a book at my expense" in response to her 'Good Morning America' interview.
Earlier this week, the 30-year-old actress gave an interview to promote her new memoir 'Things I Should Have Said', in which she called out her older sibling for her "erratic" behaviour.
And the 40-year-old pop icon has responded in a lengthy statement and revealed she watched the interview while suffering from a really high fever.
Britney began on Twitter: "So I got really sick last night ... 104 fever maybe higher, not sure because I stopped checking !!!! I'm never sick so if I do get sick I'm a drama queen !!!! I needed Aleve for the pain in my head ... I had nothing ... I called my security 'can you please go get me something to relieve the pain in my head, my fever is pretty high...'
"Immediately 'Sorry, no. I can't leave the premises. I have to stay on property.' So I said 'Of course, unless there's an emergency and I have a 104 fever...' I told him the other security leave sometimes in emergencies... it wasn't what he said to me IT WAS THE SARCASM in his voice when he told me he couldn't go get it for me... oh well...
"Looked at my phone and I see that my sister did her interview to promote her book... I watched it with a 104 fever lol and It was actually kind of nice having a fever so high cause I had to surrender to not caring.
"Just couldn't give a f*** but my head hurt so bad... of course I'm a drama queen if I get sick so I think I was dying !!! I'm not even joking ... My body had chill bumps everywhere, like I was freezing yet my body was extremely hot and I couldn't move .... it was pretty intense. (sic)"
Britney then addressed the things the former 'Zoey 101' star said that bothered her, including her "behaviour being out of control" and her sister remixing her songs.
Britney previously hit out at her sister when she performed a cover of her hit 'Till the World Ends' at an awards show in 2011.
The 'Toxic' hitmaker fumed: "Anyways, the 2 things that did bother my that my sister said was how my behavior was out of control.