William and Harry arrive for Pippa Middleton's wedding

Guests have started arriving for the wedding of the Duchess of Cambridge's sister Pippa Middleton.Tennis star Roger Federer was among the early arrivers at the event at one of the Middleton's local churches in Englefield, Berkshire.The Duke and Duchess of Cambridge's son Prince George and daughter Princess Charlotte are expected to take part in the ceremony as Miss Middleton marries hedge fund manager James Matthews.