By JODY THOMPSON Bobbydazzlers: Taylor Swift, left, shimmered in a short gold strapless gown with matching shoes, whereas Cameron Diaz, right, was wearing a tight off-the-shoulder monochrome print dress with black shoeboots Neither of them were up for any Oscars - but Cameron Diaz and Taylor Swift were the runaway winners of the shortest dress competition at the Vanity Fair party last night.Cameron arrived on the red carpet of the hottest post-Academy Awards party in a tight off-the-shoulder monochrome print mini with frill detail - although not many people were looking at her frock. Instead, all eyes were on the 38-year-old's toned physique,...