Awkward! But at this point, we think Rihanna HAS to know when and where she might be running into her ex-boyfriend, right?

On Saturday evening Rihanna was snapped partying at Eden in Hollywood, and her former flame Chris Brown was just a few doors down at Playhouse with his girlfriend Karrueche Tran. We can't imagine what a scene it would be if RiRi and Karrueche came face to face ... after all, she can't be too happy about that kiss Chris planted on his ex's mouth at the VMAs earlier this month!