BUCKLEBURY, BERKSHIRE - AUGUST 2013:  (EDITORIAL USE ONLY - NO SALES) In this handout image provided by Kensington Palace, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge pose for a photograph with their son, Prince George Alexander Louis of Cambridge, surrounded by Lupo, the couple's cocker spaniel, and Tilly the retriever (a Middleton family pet) in the garden of the Middleton family home in August 2013 in Bucklebury, Berkshire.  (Photo by Michael Middleton - WPA Pool/Getty Images)