Pattinson 'heartbroken and humiliated'

Robert Pattinson has been left "heartbroken and humiliated" after girlfriend Kristen Stewart cheated on him.

The heartthrob was stunned when he discovered his partner of four years had been caught kissing director Rupert Sanders - who she worked with on 'Snow White and the Huntsman' - and sources say he is struggling to cope with the news.

One source - who saw Pattinson and Stewart fighting backstage at the Teen Choice Awards in Los Angeles on Sunday - said: "Rob and Kristen were having a long and intense conversation backstage, and he looked miserable, heartbroken and humiliated. She was pleading."

Another source added to the New York Post newspaper: "Rob is deeply in love with Kristen and is very jealous when other men hit on her. This will crush him."

After pictures emerged of Stewart and Sanders, who has two children with his wife Liberty Ross, kissing the 22-year-old actress issued a statement saying how sorry she was.

Stewart, who started dating Pattinson after meeting on the set of the first 'Twilight' film, said: "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 jeopardised 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."

Sanders also spoke out, saying: "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 we can get through this together."