Michelle Williams is an actress.
Michelle Ingrid Williams ( born September 9 , 1980 ) is an American actress . Williams received critical acclaim for the role of Alma , wife of Ennis Del Mar , in Brokeback Mountain ( 2005 ) , for which she won a Broadcast Film Critics Association Award and was nominated for the SAG Award , BAFTA Award , Golden Globe , and Academy Award for Best Supporting Actress . Her work in Blue Valentine ( 2010 ) garnered her nominations for the Golden Globe Award and the Academy Award for Best Actress . She won a Golden Globe and an Independent Spirit Award for her portrayal of Marilyn Monroe in My Week with Marilyn ( 2011 ) , which also garnered her BAFTA , SAG , and Academy Award nominations . Michelle Williams (singer) . Making her acting debut on Broadway in Aida ( 2003 ) , she has since starred in the sitcom series Half & Half ( 2006 ) and the musical productions ; The Color Purple ( 2007 ) , Chicago ( 2009 -- 10 ) , What My Husband Does n't Know ( 2011 ) and Fela !