Blunt made her professional film debut in the 2003 TV film "Boudica", then portrayed 'Catherine Howard' in the miniseries "Henry VIII".
Her performance in the 2004 drama "My Summer of Love" earned her an 'Evening Standard British Film Award'. For her performance in the TV film "Gideon's Daughter" (2006) she received a 'Golden Globe' award for Best Supporting Actress.
For her role in "The Devil Wears Prada", she received a 'Golden Globe' nomination for Best Supporting Actress – Motion Picture and a nomination for a 'BAFTA' award for Best Actress in a Supporting Role.
In 2009, she starred in "The Young Victoria", co-starred in the crime caper comedy "Wild Target', followed by "The Adjustment Bureau" (2011), "Looper" (2012), and "Edge of Tomorrow