Britney Spears Flashes Her Insanely Flat Abs After 'Long Day Recording'

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Looks like Britney Spears has been hard at work in the studio and on her body.

The 34-year-old pop star flaunted her enviable abs in a sexy selfie on Monday, showing off her super trim figure. Donning a cropped sweater and low-waist pajama pants, Spears made it clear she hasn't been overindulging during the holidays.

"Long day it's facial time!" Spears wrote.

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It's no secret that the pop princess works hard for her body. Late last month, she tweeted this photo of herself doing a complicated yoga pose.

"Work play work play," she captioned the shot.

The "Work B**ch" singer just celebrated her 34th birthday last Wednesday, and is showing no signs of stopping. In October, she shared several photos from inside the studio where she's starting to piece together her ninth album, although no date has been announced for its release. Meanwhile, she's keeping busy with her residency show at Planet Hollywood in Las Vegas, which has extended dates through 2017.

Late last month, Beyonce and Jay Z enjoyed a fun date night at her "Piece of Me" show, with fans noting that Beyonce seemed especially into Spears’ classic 2000 jam, "Oops! ... I Did It Again."

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