Winstead split from her own husband, Riley Stearns, in May. They were married in 2010.
McGregor met Mavrakis on the set of the British TV crime series Kavanagh QC and they were married in 1995.
Mavrakis is a production designer who was born in France and raised in China. She also served as production interpreter on the Chinese set of Steven Spielberg’s 1987 movie Empire of the Sun.
The couple have four daughters together: Clara, 21, Jamyan, 16, Esther, 15 and Anouk, 6.