Casper Smart felt a little out of place at Vanity Fair’s post-Oscar party because of an uncomfortable meeting with one of Jennifer Lopez’ old boyfriends.

Soon as they arrived at the party, J.Lo made a beeline for Diddy. After making introductions, she apologized to Diddy for missing several calls and texts. People at the party commented that Casper looked really uncomfortable the whole time.

And Cameron Diaz wasn’t too happy about their little reunion either. J.Lo and Cameron may have looked chummy while they were presenting the award together, but it was rumored that they couldn’t stand each other during the filming of What To Expect When You’re Expecting. Cameron pulled Diddy away from their conversation and then made out with him all night.