In 1976 Frank Sinatra married Barbara (nee Blakeley) Marx, ex-wife of which of the Marx Brothers?

Barbara Marx Sinatra (née Blakeley; born March 10, 1927) is an American former model and showgirl who became the fourth and final wife of Frank Sinatra from 1976 until his death in 1998.

While working in Las Vegas, she met Zeppo Marx, and, on September 18, 1959, they married. Barbara's son, Bobby, assumed the family name of his stepfather. It was presumed at the time that Bobby Marx had been legally adopted by Zeppo Marx, but Tina Sinatra has claimed that, according to Robert Harrison Oliver, no such adoption took place. Barbara and Zeppo divorced in 1973.