Kristen Stewart, who sky-rocketed to stardom for her role as Bella Swan in the Twilight series, has found herself in the middle of a cheating scandal. Stewart, 22, and director Rupert Sanders, 41, were caught in a “marathon make-out session” last week. Sanders is the director of the 2012 movie “Snow White and the Huntsmen,” in which Stewart plays the lead role. A source revealed,...