Britain's Catherine, Duchess of Cambridge arrives for a visit to the Lucian Freud Portraits exhibition at the National Portrait Gallery in central London February 8, 2012. The visit was the first solo public engagement for the princess.[Photo/Agencies]

Britain's Catherine, Duchess of Cambridge leaves with Sandy Nairne, the Director of the National Portrait Gallery, following a visit to the Lucian Freud Portraits exhibition at the gallery in central London February 8, 2012. The visit was the first solo public engagement for the princess.[Photo/Agencies]