Brother and sister, Brynlie, 4, and Brayden, 2, Knowles (L-R) sit on Santa Claus's lap for a portrait at The Plaza, King of Prussia Mall, United State's largest retail shopping space, in King of Prussia, Pennsylvania on December 6, 2014. The 2.7 million square feet shopping destination is owned by Simon Property Group. Picture taken December 6, 2014. REUTERS/Mark Makela (UNITED STATES - Tags: BUSINESS)