London Fashion Week is in full swing and we couldn’t help but giggle at this behind the scenes video of the gorgeous Jourdan Dunn, Cara Delevingne and Rosie Tapner breaking into the “Harlem Shake” backstage at Topshop Unique’s Autumn Winter 2013 show. Fashion week is such a crazy time for everyone involved that it’s refreshing to see some sanity is kept with the odd dance session.