Kristen Stewart cheated on Robert Pattinson. According to several sources, the ‘Twilight’ actress had a a brief affair with a married director.

“Kristen is absolutely devastated. It was a mistake and a complete lapse in judgment”, one source told People.

Kristen’s lover was the director she worked with on ‘Snow White and the Huntsman’, 41-year-old Rupert Sanders. “She wasn’t having an affair with Rupert. It was just a fleeting moment that shouldn’t have happened. She never meant to hurt anyone. She’s a good person who just made a bad choice”, the source explained.

Rupert Sanders is married to model Liberty Ross and has two children: Skyla and Tennyson.

22-year-old Kristen Stewart has been dating Robert Pattinson since 2009. They met on the set of ‘Twilight’. At first, they were coy about their relationship, but in recently they became more about their relationship. A weeks ago, Kristen confessed she would love to have a child with Robert.