I came across this article from the website to the english gossip magazine 'Heat' (www.heatworld.com) claiming that Robert was SLEEPING with Nikki Reed? I just HOPE it's not true-here's the full article:
"Robert Pattinson is rumoured to be causing all sorts of trouble on the set of the second Twilight movie – and it's all down to his flirting. Sources from the set of New Moon are claiming that Rob has been seeing co-star Nikki Reed (she plays angry blonde vampire Rosalie), but his constant flirting with other cast members is "causing tension" on set. The source claims, "Rob's been flirting with everyone on set in front of Nikki, even though they've been sleeping together. Rob knows Nikki's not the one for him, but she thinks he'll come around and they can be a legitimate couple." The pair were originally rumoured to be an item during the filming of Twilight, but Rob has also been widely linked to Kristen Stewart, who plays his on-screen love Bella."