Robert Pattinson and Kristen Stewart (Ian Gavan/Getty Images)

Rumors are flying that 'Twilight' starlet and longtime beau of Robert Pattinson Kristen Stewart has been caught redhanded cheating with her 'Snow White and the Huntsman' director Rupert Sanders.

Just two days before the rumors went public, Stewart and Pattinson appeared together this week at the annual Teen Choice Awards where they scooped up awards for their work on the 'Twilight' films.

Us Weekly magazine has plastered a photograph of the allegedly cheating Kristen Stewart and her director turned lover Rupert on its cover, indicating that the two had a more than just a professional relationship.
Us Magazine Cover
A source also told People magazine: "Kristen is absolutely devastated. It was a mistake and a complete lapse in judgment."

Reps for neither Kristen, Rob nor Rupert have yet to make any comment that either validates or denies the swirling rumors.

A source close to Robert told E! News that he has always found fame "very difficult and isolating" and has long thought of Kristen as "the only person who he can talk to about that."

The source added: “He feels like they are both on the same level and they understand one another."

"He worships her. He doesn't think there is another woman on the planet who is as beautiful and kind as her. He wants to be with her 24/7, he wants to marry her... as far as he is concerned, Kristen is his perfect match ... Kristen is perfect to him. That's why he's always known that someday she would be his wife."

Even more shocking, Kristen's alleged hookup Rupert Sanders is married to 33-year-old model, Liberty Ross  - who also starred in ‘Snow White’ as Queen Eleanor. Sanders and Ross have two young children, Skyla and Tennyson, together.