Justin Bieber's fans help him track down a mystery girl he fell for on Instagram

Justin Bieber put out a public appeal to help track down a mystery girl with plump lips - and his fans went to work and found her.

The star, 21, shared a photo on Instagram of an Irina Shayk lookalike who had caught his eye, along with the caption: "Omg who is this!!"

Justin asked his millions of followers for help tracking her down

It didn't take long for Beliebers to identify the girl as a fellow Instagram user going by the name of Cindy Kimberly.

A private account under the name WOLFIECINDYREAL has so far notched up over 253,000 followers.

Beliebers have identified the girl as Cindy Kimberly

An account said to belong to her is at 253,000 followers

But she's believed to only be 16 or 17

Justin looks pleased with his success Getty

But luckily for Justin, other public accounts have thrown up more glam selfies.

One with 108,000 followers includes a bio saying: "My name is Cindy and I get too excited about fictional related stuff."

Fans have given Cindy their approval, with @grandelyrical saying: "My goodness Cindy Kimberly is so gorgeous."

And @blazedwbieber said: "@justinbieber her name is Cindy Kimberly have fun trying to find her."

But Justin might be having second thoughts about pursuing her, as it's been claimed that she could be only 16 or 17.

Justin recently raised hopes of a reunion with ex girlfriend Selena Gomez, 23, after serenading her in an LA hotel bar last month and posting a series of throwback photos of them together.