Eyes front Justin: Teen idol Bieber doesn't know where to look as he cosies up to Rihanna backstage

By DAILY MAIL REPORTER Keep your eyes front young man: Justin Bieber manages to avert his eyes from Rihanna's figure under her sheer Yves Saint Laurent dress backstage at the Grammy Awards last nightAs a girl-crazy pubescent teenager, Justin Bieber could have been forgiven for gawping at Rihanna's risque dress at the Grammy Awards.But as the R&B stars posed up for a photo backstage, the 16-yea...