Sienna Miller oozes androgynous chic in a tux as she joins glam Kate Winslet, Benedict Cumberbatch and James Norton at A-list carol service hosted at St George’s Church

Sienna Miller, Kate Winslet, Benedict Cumberbatch and James Norton were among the Hollywood elite attending a star-studded carol service on Wednesday evening.

The group of A-listers were seen leaving St George’s Church following the Story of Christmas Appeal last night in Hanover Square, London.

Sienna, 42, cut a cool figure in a black tuxedo and bow tie ensemble, which she styled with a white shirt and a pair of statement earrings.

The actress wore her dark blonde locks up in a chic updo and…