The World of Henry Orient (1964)

The World of Henry Orient
Comedy
A mischievous, adventuresome fourteen-year-old girl and her best friend begin following an eccentric concert pianist around New York City after she develops a crush on him.
Starring
Peter Sellers, Tippy Walker, Merrie Spaeth, Paula Prentiss, Angela Lansbury, Tom Bosley, Phyllis Thaxter, Bibi Osterwald, John Fiedler, Fred Stewart
Directed By
George Roy Hill