This weekend saw the 10th annual Tribeca Film Festival, with a very starry line up in attendance. Emma Watson, Michelle Williams, Emily Blunt and Helena Christensen were amongst the celebrity line-up who were bringing some real glamour to the proceedings. There were lots of outfits that I was lusting after, so I have found it quite hard to choose my favourites, but here they are, with some ideas on how to get the look for yourself. Helena Christensen defied age in a strikingly simple, but eye-catchingly pretty Marc by Marc Jacobs dress. This is just the perfect white summer dress that every wardrobe should have. All it needed was a…