LUXEMBOURG, LONDON - MAY 11: (NO UK SALES FOR 28 DAYS) Catherine, Duchess of Cambridge with Princess Stephanie of Luxembourg as they take a short walk outside the City Museum to view the capital during a one day visit on May 11, 2017 in Luxembourg. The Duchess will attend a series of engagements to celebrate the cultural and historic ties between the UK and Luxembourg and the official commemoration of the 1867 Treaty of London, which confirmed Luxembourg's independence and neutrality. (Photo by Pool/Samir Hussein/Samir Hussein/WireImage)
