Britney Spears went topless in an eight-second boudoir video she shared with her captive 42.7M Instagram followers on Sunday.

In it, the 42-year-old Grammy winner – who shielded her modesty with a white bed sheet – rolled around seemingly inside the master bedroom of her $11.8M Calabasas mansion.

Britney did not speak or include music in the clip, in which she’s only wearing pink panties and shiny blue knee-high boots.

It came the day after Spears’ younger sister Jamie Lynn Spears flashed her own panties in an Instagram post captioned: ‘Maybe she’s born with it, or maybe it’s @spanx and, most likely @skims too.’

The semi-retired pop star had also posted (and then promptly deleted) a snap of her formerly-estranged 32-year-old sibling, in which she wrote: ‘I’m so proud of my sister! She did so good on Dancing with the Stars!’

That’s arguable considering Jamie Lynn and her dance partner Alan Bersten were eliminated off the ABC celebrity dancing competition in episode two after scoring 16 points for their cha-cha-cha and 15 points for their tango.

Last Tuesday, Spears returned to the Los Angeles set for a group dance performance in the 32nd season finale alongside the other eliminated contestants.

The Zoey 102 star previously revealed that she and Britney spoke on the phone before she flew to Australia to compete on I’m a Celebrity…Get Me Out of Here.

‘We love each other, it’s just, you know, it’s a lot,’ Jamie Lynn said on the ITV celebrity reality TV competition.

‘I can imagine she’d be worried about me on here. I think she’s probably checking in on me heavily…My crying, she’d probably be like, “Ya’ll get her the f*** out of there, right now!” She’s a good big sister, she is. Yeah, I love her. Me and her throw down. The world’s seen that.’

The Mississippi-born blondes’ family feud stemmed from Jamie Lynn’s part in Britney’s 13-year conservatorship – petitioning the court as her SJB Revocable trustee to move money into blocked accounts with Lou Taylor’s investment firm Stonebridge in August 2020.

The Special Forces contestant also wrote that the Hold Me Closer hitmaker pulled a large knife on her in a chapter of her memoir Things I Should Have Said (originally titled I Must Confess – a lyric from Baby One More Time).

And Britney wrote that Jamie Lynn was ‘a total b****’ who was disrespectful to their mother Lynn and an ‘ungrateful’ teenager, who took her estranged father Jamie’s side during the conservatorship in her own memoir The Woman In Me.

Spears’ critically-acclaimed memoir has spent an impressive six weeks atop the New York Times’ Bestsellers Non-Fiction list while Things I Should Have Said topped Amazon’s Christian Inspirational best sellers list.

Simon & Schuster paid the former Mouseketeer a $12.5M advance (25% of the net profits) to pen the 288-page tell-all with three alleged ghostwriters – Ada Calhoun, Sam Lansky, and Luke Dempsey.

In October, Deadline reported that ‘buyers are circling’ Britney’s autobiography to make bids on the rights to make a potential limited TV series based on the book.

Meanwhile, Jamie Lynn is set to reprise her role as medical assistant Noreen Fitzgibbons in the fourth season of Sweet Magnolias, which Netflix renewed for a fourth season on November 9.

The South Carolina-set romantic drama series, developed by Sheryl J. Anderson, is based on the Sweet Magnolias novels by Sherryl Woods.