Justin Bieber has promised to shave his moustache.

The 20-year-old singer posted a picture of his facial hair on his Twitter account last night (19.09.14) but before his fans had the chance to criticise his new look, he insisted it wouldn't be sticking around for very long.

Alongside the snap, which sees him gazing into the camera lens with his face resting on his clenched fist, he wrote: ''I'll shave it calm down (sic).''

This isn't the first time the 'Baby' hitmaker has attempted to grow a moustache as he also flaunted his barely-there fluffy facial hair at the end of last month.

However, after he was bombarded with negative comments on social media, he shaved it off on camera and posted the clip on his Instagram account.

The Canadian hunk, whose appearance has changed dramatically since he first arrived on the pop scene in 2008, can be heard asking a friend in the short video, ''Should I do it?'' and ''RIP 'stache!''

He begins the clip by applying shaving cream to his face and asking his friend, ''Is this how you do it?,'' who responds by saying, ''I think that's how you do it.''

The pop star then says: ''Here I go!'' as he takes his battery-powered razor and begins to remove the hair.

Meanwhile, Justin has recently rekindled his romance with on/off girlfriend Selena Gomez, whom he first started dating in 2010, and has even reportedly asked her to move into his Los Angeles apartment with him.