Teen popstar, Justin Bieber, made an appearance at the GMTV studios this morning, and was mobbed by hundreds of screaming fans.

The singer has just released his new single U Smile which is already in the top 10 on the iTunes download chart.

Justin was greeted by fans waving banners and wearing 'I Love Justin Bieber' hoodies and looked a little overwhelmed by all the attention.

The teenager will be relaesing his new album, My World 2.0, in less than a week. Will you be buying it?