Britney Spears announces engagement: What you need to know

Britney Spears and Sam Asghari, pictured in 2018, are getting married — and there will be a prenup, says the future groom amid public concern (Photo: J. Merritt/Getty Images for GLAAD)

Popstar Britney Spears on Sunday announced her engagement to her boyfriend Sam Asghari via social media.

Spears, 39, showed off a diamond ring in an Instagram micro-video post and wrote " I can't f***ing believe it !!!!

By her side in the video is her boyfriend--now fiance--Sam Asghari, whom she turns to and kisses on the cheek.

The couple met on the set of the 'Slumber Party music video in 2016.

In the video, she says 'yes' when he popped the question to her and asked her if she likes the ring.

The four-carat diamond ring is engraved inside with a band 'lioness' because it's a nickname given to Britney by Asghari.