The singer, who became engaged to Jason Trawick last month, posted a picture of herself on Facebook posing with the ring.
"I can't stop looking at it!!" Spears wrote below the photo.
The 30-year-old is rumoured to be planning a "country wedding" where she will tie the knot in front of a close group of family and friends.
Spears's first husband Jason Alexander recently accused her of faking her engagement, saying that there is no real connection between the singer and Trawick.
Watch the video for Britney Spears's 'Hold It Against Me' below: