EXCLUSIVE: Rihanna left 1OAK night club in a great mood. The singer was looking stylish in a blue jumper, with a lot of hand jewellery.  Pictured: Rihanna Ref: SPL945902  080215   EXCLUSIVE Picture by: TwisT / Splash News  Splash News and Pictures Los Angeles: 310-821-2666 New York: 212-619-2666 London: 870-934-2666 photodesk@splashnews.com