Britney Spears didn't hold back as she slammed her sister Jamie Lynn and mom Lynne in a raging rant on Instagram.
The iconic singer, 40, said she "should've slapped" her younger sister and her mom "across their f***ing faces".
Britney's post comes after Jamie Lynn's sit-down interview with Good Morning America saw her open up about her feud with her famous sister, subsequently adding fuel to the fire.
Soon after snippets of Jamie Lynn's interview began surfacing on social media, Britney wasted no time hitting back at her younger sister as she referenced her 2002 breakup with Justin Timberlake.
Alongside a photo of two cinnamon drinks, she wrote: "I flew home to Jamie Lynn on the couch watching her TV shows right after Justin and I broke up... I was a ghost there! I had worked my whole life and I didn’t know how to be served by Mamma, sit there, and get served the chocolate milkshakes with the perfectly crushed ice with the secret chunky sugar.
"Meanwhile Jamie Lynn is 12, she indulges with the TV for hours then goes to lay out on a raft at the pool. I’m in shock because this was never my life!"
She went on: "Justin’s family was all I knew for many years. Things were different now and Jamie Lynn had a new Nickelodeon show. All I remember saying was 'DAMN! How the hell does a 12-year-old land a Nickelodeon show?
"... I'm grown up, right! But then maybe I might need a little support. It was a People Magazine cover..."
The hitmaker then seemed to reference her parents' 2002 divorce in her online rant.
She continued: "My Mamma was on pain medication and could barely hold a conversation in the house because her and my dad split and she was more messed up than anything!
"I remember her sitting on the floor in a conversation and she never got up… and I’m sorry Jamie Lynn, I wasn’t strong enough to do what should have been done… slapped you and Mamma right across your f***ing faces!"
Britney and her sister have continued to slam each other publically amid the release of Jamie Lynn's memoir Things I Should Have Said.