A security guard working at the ritzy Los Angeles hotel where Sean “Diddy” Combs was infamously caught on video brutally beating and kicking then-girlfriend Cassie Ventura testified yesterday in the rapper’s sex-trafficking and racketeering conspiracy trial. A woman was escorted out of the courtroom just before testimony was set to kick off yesterday after she went on a profane rant. "Diddy, these motherf--kers are laughing at you!" the woman screamed. She also railed against the "system" before court marshals told her "Don't do it again" and then led her out. The jury wasn’t in the courtroom during the outburst. Diddy turned around and was looking at her while she yelled.