Fans of Justin Bieber are shocked at the singer's latest revelation on social media.

On Friday (June 10), the 28-year-old singer posted a three-minute video on Instagram showing part of his face paralysed.

"As you can see this eye is not blinking. I can't smile on this side of my face ... So there's full paralysis on this side of my face," he said, adding that he has been diagnosed with Ramsay Hunt syndrome. The video has over 19 million views.