Joan O'Brien (born February 14, 1936) is an American actress and singer. She made a name for herself acting in television shows in the 1950s and 1960s, and as a film co-star with Cary Grant, Elvis Presley, John Wayne and Jerry Lewis.
Joan Marie O'Brien was born to David and Rita O'Brien on Valentine's Day 1936, in Cambridge, Massachusetts. The family moved to California when O'Brien was a child, and enrolled O'Brien in dance classes when she was eight years old. She graduated from Chaffey Union High School in Ontario, California.
O'Brien's singing abilities came to the attention of entertainer and Country Music Hall of Fame member Cliffie Stone, who hired her as a regular performer on his television show Hometown Jamboree before her high school graduation. In 1954, she became a regular on The Bob Crosby Show, and stayed until shortly before the show's cancellation in 1958. She co-starred with Cary Grant and Tony Curtis in the 1959 movie Operation Petticoat.