Karen Bjornson is an American model. She is best known as one of Halston's Halstonettes.Bjornson was born in Galesburg, Illinois in 1952, and later her family moved to Cincinnati.Bjornson moved to New York, and a month later met Halston, who hired her immediately.She went on to appear on the cover of Newsweek and Cosmopolitan.Bjornson retired in the early 1980s to start a family, and returned to modelling in the early 2000s at the age of 50.She is married to interior designer, Timothy Macdonald, they have two daughters, and have lived in Darien, Connecticut since 1989.