Sixx, 53, proposed to Bingham, 27, during a vacation to St. Barts this past weekend. The couple have been dating for two years.
This will be Sixx's third marriage. He was previously married to Playboy Playmate Brandi Brandt from 1989 to 1996, and the couple had three children together. His second marriage, from 1996 to 2007, was with actress and Playboy Playmate Donna D'Errico, with whom he has one child.