ON MAY 12, 1971, Nicaraguan socialite Bianca Pérez-Mora Macías married Rolling Stones frontman Mick Jagger in a shotgun wedding in Saint-Tropez. (Bianca was four months pregnant with their daughter Jade.) Mr. Jagger flew in many of the estimated 75 guests on a chartered plane with only a day’s notice, and such superstars as Brigitte Bardot, Paul McCartney and Ronnie Wood attended. Although the union disintegrated after seven years, and Bianca told Vanity Fair in 1986 that “a rock star is the...