<P> Geraldine Margaret Agnew - Somerville ( born 19 May 1967 ) is an Irish born actress known for her role as Detective Sergeant Jane Penhaligon in Cracker ( 1993 -- 95 ) , for which she was nominated for the 1995 BAFTA TV Award for Best Actress , and for playing Lily Potter in the Harry Potter film series . Her other film appearances include Gosford Park ( 2001 ) , My Week with Marilyn ( 2011 ) and Grace of Monaco ( 2014 ) . </P>
who plays harry 's mom in harry potter
Geraldine Margaret Agnew - Somerville