Britney Spears: 'I Didn't Eat For FOUR Days'!

Britney Spears talks about fasting!

The pop icon, 39, was back to her legendary home dances earlier today, posting for her 37.1 million Instagram followers. She added another tantalizing video to her feed, in which she showed off her insane dancing skills while rocking a revealing ensemble. Britney danced to her ex Justin Timberlake's song "Blue Ocean Floor," then changed to Billie Eilish's "Ilomilo."

In the clip, the "Toxic" hitmaker was on an expanse of tiled floor in her palatial home. Britney showed off her fit figure in a white crop top featuring a high neck and sleeveless design. It also had a red snake print around across the chest area. The garment was made of cotton material, and the hem ended an inch or two below her bust, leaving plenty of her bronzed skin exposed.

She paired the cropped tank top with bright yellow shorts that had a pattern incorporating shades of blue, red, orange, and pink. The hem grazed her thighs, leaving her sculpted legs on full display.

Britney was barefoot in the video, and she busted out several moves in the casual outfit. A thin sheen of sweat had formed on her sun-kissed skin, and her cardio-heavy routine boasted spins, arm movements, and much more. Throughout the footage, she kept her gaze focused on the camera as she moved through the tunes.

"Here’s my red snake ? top … and @BillieEilish at the end !!!! I wanted to feel graceful yesterday …." Britney captioned the dancing post.

She also mentioned that she's "on a diet for a while …. after gobble gobble day ??‍♀️?? !!!!" adding that she's "So excited for the New Year ?? !!!!"

In relation to her diet, Britney discussed "fasting," and that she has tried the method -- for four straight days.

"I wanna talk about fasting !!! A lot of people I’ve spoken to are against it … the longest I’ve gone is 4 days including snacks here and there …" she noted.

During her experience, the Grammy winner claimed she experienced "the most amazing high" by eating no food.

"I will admit I was extremely hungry at the end but I did experience the most amazing high I’ve ever witnessed with no food !!!!" Britney wrote.

She continued, "I’m not promoting hunger I’m promoting clarity but everybody’s different I guess !!!! You get it how you get it … you know ??? In some religions they fast all the time !!! Anyways … I like challenges they bring value !!!!"

Britney's followers absolutely loved the new share, and the post received more than 2.2 million views in less than 10 hours. It also racked up 5,300 comments from her eager audience.

"You look so beautiful mama!!?❤️?" fellow singer Jessica Sutta commented.

"Looking perfect, stunning, and amazing," added another follower.

Some supporters noticed how different Britney's posts are now as to when she was under the conservatorship.

"Truly spoken like someone who hasn’t been on the internet in 12 years," one wrote and another commenter agreed by writing, "I thought the very same thing, you can really tell how restricted she's actually been, finally sharing her own thoughts as she wants. It's like going back in time to when Facebook first started!"

"Your whole energy is different….so much brighter, happier, lighter," added another fan.

Britney has been working hard on her fitness. She could be seen working out alone or with her fiancé Sam Asghari, 27, on social media. Fasting may have been a suggestion from her man since he's a personal trainer. That said, he may have helped Britney cope during the entire four-day fasting period.

In a report by The Blast, the singer talked about taking the "right medication just a month ago," sharing the post a few hours before the dance video.