Apparently, Diddy isn't a Grey's Anatomy fan 'cause his peeps got a little testy with T.R. Knight and the cast at the Rolling Stone/Justin Timberlake pre-Grammy party. "Puffy was supposed to sit in the same VIP area that had four tables -- two were for him and two were for the Grey's Anatomy cast," a spy for Page Six dishes. "But he was very, very late, and there are a lot of Grey's cast members, so T.R., Kate [Walsh] and Sara [Ramirez] were at a table set up for Puffy."

Then, a security person (likely working for Diddy because the source says, "he wasn't working for the club") told T.R., Sara, and Kate to leave. "This guy goes up to T.R., Kate and Sara and started demanding -- 'Get out! Get out now! Move it,'" the source says. "T.R. was furious." (Uh, we would be too if someone made us move while J.T. was performing!)

What happened next is a little, er, gray. According to Page Six, Diddy and T.R. "exchanged words" before the Grey's cast were sent to sit elsewhere. But one of Diddy's friends says that it didn't go down that way though. "Listen, if they were moved, it wasn't because Puffy told [his bodyguard to move them]," the source says. "He wasn't aware of what was going on -- he had a great time and didn't realize anyone was upset." The party's rep refused to comment on the sitch, and Diddy's flacks obviously deny the altercation. But Page Six's source stands by the story: "I was there, I saw it, some words were said. I don't think Puffy knew who T.R. was." What does Diddy watch on Thursday nights -- The O.C.?