Kristen Stewart is reported to be staying at film producer Giovanni Agnelli's house and now sources claim that Robert Pattinson is "suspicious of his motive in taking her in."

"(Robert) wants to know why Kristen is staying there at his house?" an insider told Radar Online. "He is super angry now and has accused Giovanni of sleeping with Kristen too."

"Giovanni got a call from Pattinson around four this morning, threatening him if he has been sleeping with Kristen," the source added. "Rob is beside himself over Kristen's betrayal. No one has ever seen him like this."

Gossip Cop reports that the story of Stewart staying at Agnelli's house "is made up and completely untrue."

Agnelli took to Twitter recently to defend Stewart:

@hollywoodlife: hope nobody thinks shit for brains gossip sites like @HollywoodLife are real! They puke lies, lick them up, and puke them out again.

When Hollywood Life tweeted to Agnelli asking him whether he has "different information",  he replied, "Yes I do...Go f*** yourself."

Angelli produced the 2010 film "Welcome to the Rileys" starring Stewart and James Gandolfini.

Stewart and Pattison's relationship ended after her affair with her "Snow White and the Huntsman" director Rupert Sanders was exposed.

US Weekly published intimate images of the 22-year-old kissing and embracing the married father of two weeks ago. She issued a statement on July 25 apologizing to Stewart and her fans.

Tags: Kristen Stewart rupert sanders kristen stewart cheating kristen stewart rupert sanders