​From Wikipedia, the free encyclopedia. Mary Collinson  (born July 22, 1952 in Malta) is a model and actress . She was chosen as Playboy magazine's Playmate of the Month in October 1970, together with her twin sister Madeleine Collinson. They were the first identical twin Playmate sisters. The Collinson Twins first arrived in Britain in April 1969, and prior to their appearance in Playboy one of the first people to use them was the famed glamour photographer/film maker Harrison Marks who cast ...