She recently admitted she had been hitting the gym harder than usual ahead of shooting the video.
But Britney Spears' super slender Work B*tch body might not have been entirely down to her new gym routine.
New pictures accidentally released by the visual effects company behind the music video (HOAX) appear to show Britney looking a little more curvy than she does in the finished product.
The new snaps have sparked airbrush rumours with the 31-year-old facing backlash from fans on Twitter.
One user wrote: "Lmao at camp Britney Spears having to airbrush her to look skinny."
[ Britney Spears puts her best assets on display on stage ]
But others weren't quite so fast to blame Britney, instead insisting the yummy mummy shouldn't need to be airbrushed.
One wrote: "Here we go again, what's so wrong with the real Britney. Looks much healthier than the airbrush version."
Another quipped: "Everyone complaining about Britney using photoshop/airbrush when every popstar and their mothers on Instagram all use photoshop."
HOAX Films have made no mention of the airbrushing since removing the pictures from their website and instead have focused on their work on the project.
In a press release on SoundandPicture.com, they stated: "HOAX Films completed sky replacements shots, set extensions and cleanup."
This isn't the first time Britney has come under fire for airbrush, purposely releasing unairbrushed pictures of herself from her Candies campaign in 2010 to prove she's not perfect.
A source at the time said: "Britney is proud of her body - imperfections and all."