Kristen Stewart wore a gray hoodie this morning when she touched down at London's Heathrow Airport. She headed to England after a few weeks in California. Kristen was in LA to prep for her upcoming role in Snow White and the Huntsman. She also ventured south to San Diego to make a cameo at Comic-Con on behalf of that film and her new Twilight installment. The latter press opportunity gave Kristen a chance to meet up with Robert Pattinson, who spent most of his Summer up in Canada working on Cosmopolis.