Julia Roberts, once one of the most recognizable celebrities in America, known for her radiant smile and iconic roles, appeared almost unrecognizable at 44 while filming alongside Ewan McGregor. The actress, who shot to fame as Vivian Ward in the 1990 hit “Pretty Woman,” underwent a significant transformation for her role in August: Osage County, filmed in Bartlesville, Oklahoma. In stark contrast to her glamorous image, Roberts was seen without makeup, dressed in dowdy clothing…