Justin Bieber fans besiege studios as star appears on GMTV

Justin Bieber was bombarded by crowds of screaming fans this morning as he appeared on GMTV.

Outside the studio, hoards of ecstatic girls went bonkers for the Canadian teen heartthrob, who was on the show to talk about his new single, Baby.

News that the 16-year-old singer was to appear on GMTV caused a Twitter frenzy - with his early morning chat becoming one of the most talked about topics