The prime minister and his wife have arrived at the Abbey, ready to watch their country's newest royal couple plight their troth.
Proving why she is Britain's fashion ambassador, Samantha Cameron looked every inch the fashionista in a ruched yet fitted teal silk dress fashioned by Burberry London.
She accessorised her simple yet chic dress with a splash of contrasting colour, wearing an orange drop-pendant statement necklace and carrying a shawl in the same shade.
Meanwhile, husband David was very well turned out in tails.
This put to rest months of speculation over whether he would stick to tradition and wear the morning suit - as is usually the case with prime ministers - or opt for a more modern lounge suit.