Did Kristen Stewart have another moment of “indiscretion”?

Robert Pattinson is reportedly accusing the actress of sleeping with another Hollywood heavyweight. According to Radar Online, Rob is “angry” that his estranged girlfriend is staying with her producer pal Giovanni Agnelli and suspicious of his motives.

A source says the Twilight hunk has been calling the producer wanting to know why Kristen is staying at his house. “He is super angry now and has accused Giovanni of sleeping with Kristen, too.”

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The insider adds, ”Giovanni got a call from Pattinson around four this morning, threatening him if he has been sleeping with Kristen. Rob is beside himself over Kristen’s betrayal. No one has ever seen him like this.”

Kristen recently copped to having a fling with married director Rupert Sanders.

Kristen stewart is a #trampire …how dare he cheat on Robert!!!!

— Jimmy James Hunter (@JimmyJHunter) August 4, 2012