That's not so, says Sanders' own brother-in-law.
Leopold Ross, brother of Sanders' actress wife, Liberty Ross, told the Brit newspaper, The People, “It was from the last half of filming and all through post-production, clear into last week.”
The movie shot from September 19 to December 10, 2011, meaning that the affair actually began last fall, according to Leopold.
His sister, who had a small role as Kristen's mother in Snow White and the Huntsman, had left England with Rupert and primarily stayed home raising their two children, so that he could pursue his dream of becoming a successful Hollywood director.
“She made some sacrifices for something she thought was worth it, now she knows, right? Five minutes from her home...."
As RadarOnline.com has been reporting, both Pattinson and Stewart have moved out of his home in L.A.'s Los Feliz neighborhood, and are not even speaking to each other.
The cheating scandal has likely derailed plans for a Snow White sequel. Plans for Stewart and Pattinson to appear together at MTV's Music Video Awards September 9 are also in doubt.