'Who's that girl?' - Justin Bieber's bizarre message to gym

The internet has been set alight after screenshots of Justin Bieber appearing to message a gym about one of its staff members went viral on Twitter.

Georgia-based Fitness on Broughton posted a boomerang of 22-year-old trainer and front desk manager Jessica Gober with an energy drink to its Instagram account on Wednesday. 

Later that day, the gym received direct message from Bieber's Instagram account asking about Gober.

"Who is that girl?" he posted, followed by a love heart emoji.

Gober then tweeted a screenshot of the direct message, followed by four photos with her boyfriend, writing "I've got everything I need right here".

It is unclear how Bieber found the photo: it had no hashtags, and prior to Gober's tweets going viral, the gym's account had a modest 73 followers.

Some of the gym's other photos are hashtagged, and it's thought maybe Bieber was scrolling through #gains or #noexcuses and happened upon the gym.

Fitness on Broughton says Gober replied to his message with her name and details, but has not yet received a reply from Bieber.

This is not the first time Bieber has searched for a mystery girl on Instagram.

In 2015 he posted a picture of a random girl to his account with the caption 'Omg who is this!!'

It turned out to be a 17-year-old girl from Spain who acquired a modelling contract soon after the post.