Watch: Britney Spears Announces Engagement To Boyfriend Sam Asghari

Pop singer Britney Spears and Sam Asghari met in 2016 when they co-starred in a music video for her single "Slumber Party."

Pop princess 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. "Look at that -- you like it?" Asghari, 27, asks.