The set of XXX:Return of Xander Cage may have been a rough and tough movie but the cast sure knows how to lighten the mood. Co stars Nina Dobrev and Ruby Rose admitted that during filming, they were in the middle of a huge prank war. Rose hired a Taylor Swift impersonator to serenade Dobrev has one of the pranks but turns out, the impersonator was a huge fan, got nervous, and hit her head! "She started bleeding," Dobrev shared on The Late Late Show Thursday night.