On Saturday, March 12th, Neil Patrick Harris posted Instagram photos of his children, daughter Harper Grace, and son, Gideon Scott. The star of How I Met Your Mother and his husband, David Burtka were invited to stay at the lavish Plaza Hotel in New York City after Harris had been filming a secret project there all day. Harris wrote on the instagram caption, "Yesterday I filmed a secret thing that I can't discuss, but it was filmed at the Plaza Hotel.