American A-listers are currently pledging their allegiance with either one of two brands. No, the battle isn't between Prada or Chanel – surprisingly, its between Matthew Williamson for H&M and everything at the new Topshop in New York (including Barbara Hulanicki's collection) And we're having trouble keeping the score board up to date! Looks like any stylish frugalista with an ounce of fashion nous is hunting down catwalk-worthy looks on the high street. Mary Kate Olsen, who was present at the H&M launch but not Topshop's debut in NY, has switched teams with a Topshop wardrobe expanding on a daily basis. First the Hulanicki moth chiffon dress, then the holey Rodarte-esque jumper and now a pink bandage skirt. What next, MK? We can't wait to see. But in the mean time, we've got a constant roll-call of stars wearing Matthew Williamson for H&M's dresses and it was only the other day that Mischa Barton mixed up her cool Britannia look with a pair of Asos distressed jeans. So that's our Bank Hol plans all wrapped up. To the high street!