Teen sensation Justin Bieber stopped off in London recently to promote his forthcoming new album 'Believe' and was seen wearing an unusual accessory.

The 'Boyfriend' hitmaker was photographed sporting a jewelled face mask, which was emblazoned with the design of a skull's nose and lower jaw, as he walked around England's capital.

He sat down for an interview with British funnyman Alan Carr and tweeted about the television segment, joking: "didnt understand anything you guys were saying but always fun. thanks for having me @chattyman"

Bieber is set to perform at Capital FM's Summertime Ball on Saturday (June 9) and informed his followers that he loves being in the country, adding: "LONDON IS CRAZY!! LOVING IT!!"

Despite revealing his excitement at being in London, he admitted that certain things get lost in translation and asked his 22.9 million Beliebers "what the heck is barley water? #london."

Listen to 'Die In Your Arms', which features on 'Believe', in full here: