Petra Shops Intermix Posted on October 27, 2011 by LPark Petra Ecclestone ◄ Back Next ► Picture 1 of 3 Photo by David Aguilera/BuzzFoto.com British-Croatian heiress, model, fashion designer and socialite Petra Ecclestone was seen shopping at Intermix Clothing yesterday (October 26) for pants and button-down shirts.