Just around the corner from The Independent's office is a semi-permanent camp of teenage girls outside a hotel. The reason? It is where Justin Bieber is staying while in London. And every time there is so much of a glimpse of his low-slung tracksuit bottoms, the group's screams hit ear-piercing levels and even stop traffic. If reports are to be believed, Bieber, 18, could be reunited with a teen magnet of yesteryear – Elvis Presley. The team behind the recent hologram concert of Tupac Shakur is reportedly planning a Bieber-Elvis duet.