Justin Bieber performed a surprise duet on The View yesterday morning (23rd November) when he was joined on stage by Mary J. Blige.The 'Baby' singer was interviewed on the US chatshow before giving a rendition of his festive single 'Mistletoe'.Halfway through the performance the Canadian pop star was joined by R&B songstress Mary for an unprecedented duet.Earlier in the day Justin was joined on stage by mentor Usher for a special mini-concert on Today of 'The Christmas Song (Chestnuts Roasting On An Open Fire)'.
