Yesterday news of Liam Hemsworth cheating on Miley Cyrus with Emma Roberts surfaced over the web. Now, it's an all new celebrity couple drama involving the "Twilight" couple, Kristen Stewart and Robert Pattinson.

News is that Kristen Stewart had allegedly cheated on Robert Pattinson with a married man. How true are the rumors or is this simply a publicity stunt?

Rumor has it that "The Fairest of Them All" has taken a liking to the director of the film, "Snow White & the Huntsman", Rupert Sanders. Though the rumors have no substance to it and appear to be another publicity stunt. Stewart and Pattinson have yet to release a statement regarding the rumors. People Magazine however says differently.

"Kristen is absolutely devastated," says a source to People Magazine, adding, "It was a mistake and a complete lapse in judgment."

The Magazine had even published a photo of Stewart and Sanders wrapped in a romantic embrace on the cover. Reps of both parties have failed to come out and explain the said rumors. The so-called fling had occurred right after filming "Snow White and the Huntsman".

"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," explains the source.

Another tabloid, Us Weekly, also reported that Stewart and Sanders were caught in a heavy make-out session at Los Angeles last July 17. Photographers have dubbed it as a "marathon make-out session" wherein both parties simply could not get enough of each other.

"It seemed like they couldn't get enough," says one photographer to the magazine.

What would "twi-hards" dub these rumors as? Still, Robert and Kristen did step out together for the red carpet event of the Teen's Choice Awards last Sunday, July 22. The "Robsten" duo did not likely to appear to have a relationship problem. Yet, the rumors of Kristen's fling with Sanders broke out days after. Still, Robert Pattinson who had his own cheating rumors with Nikki Reed and a whole lot of other Hollywood women, would fans of the "Robsten" duo believe such lies?

"He worships her," says a source to E Online on Robert Pattinson's adoration for girlfriend, Kristen Stewart. "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," added the source.

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