Kristen Stewart has cheated on Robert Pattinson! Shocked that this Twilight power-couple have come to this?

Stewart, 22, has apologized publicly for having an affair with Rupert Sanders, director of her film Snow White and the Huntsman.

Us Weekly published photographs of Stewart sharing some intimate moments with Sanders, 41, nearly 20 years her senior.

The two were spotted on July 17 in L.A. and the pics are everywhere.

Stewart released an apology, saying she is saddened that she has hurt her boyfriend of three years, Pattinson, 26.

“I’m deeply sorry for the hurt and embarrassment I’ve caused to those close to me and everyone this has affected. This momentary indiscretion has jeopardized the most important thing in my life, the person I love and respect the most, Rob. I love him, I love him, I’m so sorry.”

The very married Sanders, who is also a father of two, released an apology of his own:

“I am utterly distraught about the pain I have caused my family.  My beautiful wife and heavenly children are all I have in this world. I love them with all my heart. I am praying that we can get through this together.”

Sanders is married to Liberty Ross, with whom he has two children ages 7 and 5.  Ross is a model and ironically she portrayed Stewart’s mother in Snow White and the Huntsman.

What was Stewart thinking? What was Sanders thinking?

RPatz must be heartbroken but surely he would have millions of women ready to console him!