Sienna Miller celebrates her 26th birthday with a party at Cliftons Pub in North London on Friday night. The British actress was accompanied by boyfriend Rhys Ifans , supermodel pal Kate Moss , socialite Davinia Taylor , musician Jamie Hince , actress Keira Knightley and Keira ’s actor boyfriend Rupert Friend . WHAT DO YOU THINK of Sienna’s outrageously loud birthday outfit?