The former X Factor US judge titled the site, All Eyes On Me, with 28 days currently counting down on the clock.
It is thought that the countdown is the build-up to Britney's new single or album.
will.i.am, who has been working as executive producer on Britney's eighth studio album, tweeted last week (13 August): "The song @britneyspears did with #williamORBIT is fabulous and out of this world... #THEbritneyARMYwillBEproud."
Britney added: "That song is from another planet. I hope Earth is ready!!!"
Fans have also been in a frenzy since Britney announced earlier this month that her follow-up album to her 2011 release Femme Fatale was coming sooner than we think.
The 31-year-old, who recently unveiled the video to her Smurfs 2 soundtrack song 'Ooh La La', explained that her new album needs to be "perfect".
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Take a look at Britney's music videos throughout the years:
Copyright: Britney Spears / VEVO