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"Kristen Stewart is alleged to have cheated on boyfriend Robert Pattinson. Two magazine reports in the United States have claimed that the Twilight actress had a &amp;quot;brief fling&amp;quot; with Rupert Sanders, who was her director in Snow White and the Huntsman.   [Left: Stewart with Pattinson at Twilight premiere / Right: Stewart and Sanders at Snow White shoot] &amp;quot;Kristen is absolutely devastated,&amp;quot; a source claimed to People. &amp;quot;It was a mistake and a complete lapse in judgment. &amp;quot;She wasn&amp;#039;t having an affair with Rupert. It was just a fleeting moment that shouldn&amp;#039;t have happened. She never meant to hurt anyone. She&amp;#039;s a good person who just made a bad choice.&amp;quot;  Us Weekly has also claimed to have photographic evidence to support the allegations, with scans from the inside of the magazine later leaking online.  [Stewart with Sanders at Snow White photocall] Gossip Cop has suggested that &amp;#039;something did happen&amp;#039; between Stewart and Sanders, but a source allegedly close to Stewart added: &amp;quot;It&amp;#039;s not a relationship. She made a mistake. She feels awful. She&amp;#039;s not with him.&amp;quot; Stewart and Pattinson first met on the set of Twilight and appeared together at the Teen Choice Awards on Sunday night (July 22) in Los Angeles.  Alongside co-star Taylor Lautner, they accepted the &amp;#039;Ultimate Choice&amp;#039; award in recognition of the Twilight movies&amp;#039; international box office success. Sanders is married to model Liberty Ross, and the couple have two children together. Photo gallery - Kristen Stewart - her career to date in pictures:  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/showbiz/kristen-stewart-and-robert-pattinson/news/a395090/kristen-stewart-cheated-on-robert-pattinson-with-snow-white-director/>