Kristen Stewart has made a cuckold of Robert Pattinson. But how long was the affair going on before she and Sanders got caught? Sources close to Stewart maintained that it started just weeks ago, but also that she and Sanders had only made out; does this look like the arching back of someone who only just made out? No way.

According to Leopold Ross, brother of scorned wife Liberty Ross, the affair had been going on for about six months. He told UK's The People:

"It was from the last half of filming [of Snow White and the Huntsmen] and all through post-production, clear into last week."

Girlfriend should have taken her own advice (she is supposedly saying, "Stop," to Sanders on the red carpet).

[Images via Getty, GIF via Twitter]