Just a month or so ago, the 36-year-old model was parading shoulder-length hair at the launch of Topshop's new flagship store in London’s Knightsbridge.  Yet on Wednesday night, she was photographed leaving her Soho hotel with tumbling blonde tresses.

Kate has sported various different styles over the last year, from short crops to classic bobs.  This new style with extensions is the longest we’ve seen yet.  She has just returned from a holiday in Ibiza, which may have inspired the sun-kissed look.  Her roots, however, remain dark.  Some may think this looks a little dishevelled, but in fact it’s quite a hot trend right now.  Stars such as Gwen Stefani and Sarah Jessica Parker have also been purposefully keeping their roots dye-free.

Kate has always been something of a trend-setter, and thankfully this new look is easy to re-create with some simple clip-in extensions, which can transform the most lifeless locks into sweeping manes, in a matter of minutes.