On Saturday, actor Dick Van Dyke celebrated his 90th birthday with a Mary Poppins-themed flash mob with his wife, Arlene Silver-Van Dyke and took part in a sing-along. Van Dyke, who played Bert and Mr. Dawes Sr. in the beloved 1964 Disney musical film, watched the flash mob performance from an upper level of L.A.'s shopping mall The Grove and cheered loudly. Van Dyke later joined the crowd to sing another song from Mary Poppins, "Let's Go Fly a Kite." They also sang "Happy Birthday" to him. On Sunday, he was honored at?where else??Disneyland.