A source tells Hollyscoop, ''Jennifer and Casper had a somewhat awkward run-in with Diddy last night. It is the first time Jennifer has seen him in years and everyone was watching when they went up to say hello to him. They were cordial to each other but she didn't hug him. Casper shook Diddy's hand and it was very brief. She looked like she was trying to avoid the hello, but it was impossible.''