By Rollo Ross LONDON (Reuters) – British boy band One Direction was greeted by more than 3,000 screaming fans on Tuesday for the London premiere of its new 3D documentary "This Is Us," while music mogul and manager Simon Cowell addressed his impending fatherhood for the first time. Cowell, 53, the owner of music and television production company Syco, which manages One Direction, is expecting a child with his friend's ex-wife, socialite Lauren Silverman. …
