![Sienna Miller wearing Cartier jewelry arrives to the Cartier Los Angeles Party to launch the Panthere de Cartier Watch Collection, held at Milk Studios in Los Angeles, California, Friday, May 5, 2017. ( Sienna Miller wearing Cartier jewelry arrives to the Cartier Los Angeles Party to launch the Panthere de Cartier Watch Collection, held at Milk Studios in Los Angeles, California, Friday, May 5, 2017. (](https://c8.alamy.com/comp/2ETRB5T/sienna-miller-wearing-cartier-jewelry-arrives-to-the-cartier-los-angeles-party-to-launch-the-panthere-de-cartier-watch-collection-held-at-milk-studios-in-los-angeles-california-friday-may-5-2017-photo-by-jennifer-graylock-please-use-credit-from-credit-field-2ETRB5T.jpg)
Sienna Miller wearing Cartier jewelry arrives to the Cartier Los Angeles Party to launch the Panthere de Cartier Watch Collection, held at Milk Studios in Los Angeles, California, Friday, May 5, 2017. (
![Sienna Miller wearing Cartier jewelry arrives to the Cartier Los Angeles Party to launch the Panthere de Cartier Watch Collection, held at Milk Studios in Los Angeles, California, Friday, May 5, 2017. ( Sienna Miller wearing Cartier jewelry arrives to the Cartier Los Angeles Party to launch the Panthere de Cartier Watch Collection, held at Milk Studios in Los Angeles, California, Friday, May 5, 2017. (](https://c8.alamy.com/comp/2ETRAT0/sienna-miller-wearing-cartier-jewelry-arrives-to-the-cartier-los-angeles-party-to-launch-the-panthere-de-cartier-watch-collection-held-at-milk-studios-in-los-angeles-california-friday-may-5-2017-photo-by-jennifer-graylock-please-use-credit-from-credit-field-2ETRAT0.jpg)
Sienna Miller wearing Cartier jewelry arrives to the Cartier Los Angeles Party to launch the Panthere de Cartier Watch Collection, held at Milk Studios in Los Angeles, California, Friday, May 5, 2017. (
![Katie Holmes, Rooney Mara & Sienna Miller Get Glam for Cartier Fifth Avenue Grand Reopening!: Photo 3752217 | 2016 New York Fashion Week September, David Burtka, Edward Norton, Ellie Goulding, Hannah Bronfman, Katie Holmes, Rooney Mara & Sienna Miller Get Glam for Cartier Fifth Avenue Grand Reopening!: Photo 3752217 | 2016 New York Fashion Week September, David Burtka, Edward Norton, Ellie Goulding, Hannah Bronfman,](https://cdn.justjared.com/wp-content/uploads/2016/09/holmes-cartiernyf/katie-holmes-rooney-mara-sienna-miller-get-glam-for-cartier-fifth-avenue-grand-reopening-01.jpg)
Katie Holmes, Rooney Mara & Sienna Miller Get Glam for Cartier Fifth Avenue Grand Reopening!: Photo 3752217 | 2016 New York Fashion Week September, David Burtka, Edward Norton, Ellie Goulding, Hannah Bronfman,
![Jake Gyllenhaal, Sienna Miller Toast Cartier's Newest Watch in San Francisco – The Hollywood Reporter Jake Gyllenhaal, Sienna Miller Toast Cartier's Newest Watch in San Francisco – The Hollywood Reporter](https://www.hollywoodreporter.com/wp-content/uploads/2018/04/cartierannualinternationalparty-sofia_boutellla_lilly_collins43-h_2018.jpg?w=1296)
Jake Gyllenhaal, Sienna Miller Toast Cartier's Newest Watch in San Francisco – The Hollywood Reporter
![Katie Holmes, Rooney Mara & Sienna Miller Get Glam for Cartier Fifth Avenue Grand Reopening!: Photo 3752250 | 2016 New York Fashion Week September, David Burtka, Edward Norton, Ellie Goulding, Hannah Bronfman, Katie Holmes, Rooney Mara & Sienna Miller Get Glam for Cartier Fifth Avenue Grand Reopening!: Photo 3752250 | 2016 New York Fashion Week September, David Burtka, Edward Norton, Ellie Goulding, Hannah Bronfman,](https://cdn.justjared.com/wp-content/uploads/2016/09/holmes-cartiernyf/katie-holmes-rooney-mara-sienna-miller-get-glam-for-cartier-fifth-avenue-grand-reopening-34.jpg)
Katie Holmes, Rooney Mara & Sienna Miller Get Glam for Cartier Fifth Avenue Grand Reopening!: Photo 3752250 | 2016 New York Fashion Week September, David Burtka, Edward Norton, Ellie Goulding, Hannah Bronfman,
![57 Sienna Miller Hosts The Cartier Bow Celebration Photos and Premium High Res Pictures - Getty Images 57 Sienna Miller Hosts The Cartier Bow Celebration Photos and Premium High Res Pictures - Getty Images](https://media.gettyimages.com/id/106120504/photo/sienna-miller-during-sienna-miller-hosts-the-cartier-bow-celebration-at-cartier-mansion-in-new.jpg?s=612x612&w=gi&k=20&c=Ani8Oeo-HjjSWvnBcTHWLQRbJ_Ofd8soP2hJYUEV3QQ=)
57 Sienna Miller Hosts The Cartier Bow Celebration Photos and Premium High Res Pictures - Getty Images
![Katie Holmes, Rooney Mara & Sienna Miller Get Glam for Cartier Fifth Avenue Grand Reopening!: Photo 3752249 | 2016 New York Fashion Week September, David Burtka, Edward Norton, Ellie Goulding, Hannah Bronfman, Katie Holmes, Rooney Mara & Sienna Miller Get Glam for Cartier Fifth Avenue Grand Reopening!: Photo 3752249 | 2016 New York Fashion Week September, David Burtka, Edward Norton, Ellie Goulding, Hannah Bronfman,](https://cdn.justjared.com/wp-content/uploads/2016/09/holmes-cartiernyf/katie-holmes-rooney-mara-sienna-miller-get-glam-for-cartier-fifth-avenue-grand-reopening-33.jpg)