It’s official: Yellow is the new pink – and who better to cement this new wedding guest trend than British actress Sienna Miller! Over the weekend, Sienna turned heads at her friend’s wedding in Italy wearing a low cut, canary silk yellow dress. Sienna, and her partner-in-crime Oli, attended the Venice wedding together, and talk about couple goals! They were both snapped in slew of photos by the paparazzi, enjoying the sunny Italian skies and their friend&#