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Kristen Stewart cheats on Robert Pattinson: Biggest celeb cheating scandal?

Kristen Stewart New 640

Kristen Stewart (AP)

Is this the end of R-Patz and K-Stew? Kristen Stewart, 22, was photographed last week in a "marathon makeout session" with her married "Snow White and the Huntsman director," 41-year-old Rupert Sanders, Us Weekly reports. "It seemed like they couldn't get enough," one photographer told the mag.

SODAHEAD SLIDESHOW: See the biggest celebrity cheating scandals. 

Kristen has been romantically involved with her "Twilight" co-star, 26-year-old Robert Pattinson, for as long as anyone can remember (although it took them forever to finally admit it). Sanders is married to 33-year-old British Vogue model Liberty Ross, and has two children, ages 7 and 5. While the picture on the cover doesn't exactly scream "marathon makeout session," it is a bit sensual ...

PHOTOS: See the latest celebrity pictures to hit the Internet. 

From K-Stew's alleged betrayal of R-Patz to Tiger Woods' shocking infidelity, let us know: What was the biggest celeb cheating scandal?

<a href="http://www.sodahead.com/entertainment/kristen-stewart-reportedly-cheats-on-robert-pattinson-biggest-celeb-cheating-scandal/question-2826479/" title="Kristen Stewart Reportedly Cheats on Robert Pattinson: Biggest Celeb Cheating Scandal?">Kristen Stewart Reportedly Cheats on Robert Pattinson: Biggest Celeb Cheating Scandal?</a>

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