Sienna Rosie Diana Miller (born December 28, 1981) is an American-born English actress. Born in New York City and raised in London, she began her career as a photography model, appearing in the pages of Italian Vogue and for the 2003 Pirelli calendar. Her acting breakthrough came in the 2004 films Layer Cake and Alfie. She subsequently portrayed socialite Edie Sedgwick in Factory Girl (2006) and author Caitlin Macnamara in The Edge of Love (2008), and was nominated for the 2008 BAFTA Rising Star Award. Her role as The Baroness in G.I. Joe: The Rise of Cobra (2009) was followed by a brief sabbatical from the screen amid increased tabloid scrutiny.
Miller returned to prominence with her role as actress Tippi Hedren in the television film The Girl (2012), for which she was nominated for the BAFTA Television Award for Best Actress and the Golden Globe Award for Best Actress – Miniseries or Television Film. Further critical acclaim followed throughout the 2010s, with appearances in the films Foxcatcher (2014), American Sniper (2014), Mississippi Grind (2015), The Lost City of Z (2016), Live by Night (2016), and American Woman (2018), as well as the miniseries The Loudest Voice (2019).
My Mother’s Wedding
Victoria
2025
Horizon: An American Saga - Chapter 2
Frances Kittredge
2024
Horizon: An American Saga - Chapter 1
Frances Kittredge
2024
Indomitable
Narrator
2023
Scandalous: Phone Hacking on Trial
Self
2023
An Imperfect Murder
Vera Lockman
2017
The Lost City of Z
Nina Fawcett
2017
Live by Night
Emma Gould
2016
The Tale of Thomas Burberry
Sara
2016
So Good to See You
Frances
2016
High-Rise
Charlotte Melville
2015
Burnt
Helene
2015
Mississippi Grind
Simone
2015
The Making Of 'American Sniper'
Self
2015
One Soldier's Story: The Journey of American Sniper
Self
2015
Unfinished Business
Chuck Portnoy
2015
American Sniper
Taya Renae Kyle
2014
Foxcatcher
Nancy Schultz
2014
A Case of You
Sarah Schipper
2013
Just Like a Woman
Marilyn
2013
Nous York
The Movie Star
2012
The Girl
Tippi Hedren
2012
Yellow
Xanne
2012
2 Jacks
Diana
2012
The September Issue
Self
2009
G.I. Joe: The Rise of Cobra
Ana Lewis / Baroness
2009
The Edge of Love
Caitlin MacNamara
2008
Camille
Camille Foster
2008
The Mysteries of Pittsburgh
Jane Bellwether
2008
Stardust
Victoria
2007
Interview
Katya
2007
Factory Girl
Edie Sedgwick
2006
Casanova
Francesca
2005
Alfie
Nikki
2004
Layer Cake
Tammy
2004
Raised Eyebrows
Erin Fleming
South Kensington
Sharon
2001
Secret Daughter
Twiggy
Self
2025
Extrapolations
Becca Shearer · (3 episodes)
2023
Chivalry
Lark · (2 episodes)
2022
Anatomy of a Scandal
Sophie Whitehouse · (6 episodes)
2022
Wander Darkly
Adrienne
2020
War & Grace
Narrator
2020
21 Bridges
Frankie Burns
2019
The Loudest Voice
Elizabeth 'Beth' Ailes · (7 episodes)
2019
The Catcher Was a Spy
Estella Huni
2018
American Woman
Deb Callahan
2018
National Theatre Live: Cat on a Hot Tin Roof
Maggie
2018
Die Clint Eastwood Story
Self
2018
Untitled Jack Ryan Film
Madden
Carol Davis
The Late Show with Stephen Colbert
Self · (1 episode)
2015
The Late Late Show with James Corden
Self - Guest · (1 episode)
2015
Late Night with Seth Meyers
Self · (2 episodes)
2014
The Tonight Show Starring Jimmy Fallon
Self · (4 episodes)
2014
Off Camera with Sam Jones
Self · (1 episode)
2014
Conan
Self · (1 episode)
2010
The Tonight Show with Conan O'Brien
Self · (1 episode)
2009
The Graham Norton Show
Self · (5 episodes)
2007
Keen Eddie
Fiona Bickerton · (13 episodes)
2003
Jimmy Kimmel Live!
Self · (1 episode)
2003
Top Gear
Self · (1 episode)
2002
The American Embassy
Babe · (1 episode)
2002
Friday Night with Jonathan Ross
Self - Guest · (1 episode)
2001
Bedtime
Stacey · (9 episodes)
2001
Curb Your Enthusiasm
Sienna Miller · (3 episodes)
2000
The View
Self · (1 episode)
1997
The Daily Show
Self · (2 episodes)
1996
Late Night with Conan O'Brien
Self - Guest · (2 episodes)
1993
GMTV
Self · (1 episode)
1993
The Tonight Show with Jay Leno
Herself · (2 episodes)
1992
LIVE with Kelly and Mark
Self - Guest · (1 episode)
1988
Top Gear
Self · (1 episode)
1978
Today
Self · (1 episode)
1952