(Cover) - EN Showbiz - Kristen Stewart was seen "pleading" with Robert Pattinson at the Teen Choice Awards.

This week, the 22-year-old actress admitted that she had a brief affair with her Snow White and the Huntsman director Rupert Sanders. Robert is said to be "devastated" by his girlfriend's betrayal and sources claim they were arguing backstage at the awards ceremony last weekend.

"Rob and Kristen were having a long and intense conversation backstage, and he looked miserable, heartbroken and humiliated. She was pleading," the insider told New York Post.

On July 17 photos were taken of Kristen and Rupert in a "marathon make-out session" in Los Angeles. It has been claimed that Kristen begged the photographer not to publish the pictures. After her pleas were unsuccessful, she told Robert she had been unfaithful last week.

"Rob is deeply in love with Kristen and is very jealous when other men hit on her. This will crush him," a source revealed to the publication.

Kristen has issued a statement saying she is "so sorry" for hurting the British actor and jeopardising their relationship.

Director Rupert has also apologised to his wife Liberty Ross and their children for his infidelity. (C) Cover Media