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Sienna Miller: See the Stunning Actress to Celebrate Her 42nd Birthday

By:
Paige Kindlick
December 28, 2023 1:00PM EST
Sienna Miller
Image Press Agency/NurPhoto/Shutterstock

Sienna Miller won the heart of Hollywood from the moment she crossed the pond. Click through to check out the best snaps of the British actress through the years!

Sienna Miller won the hearts of Hollywood from the second she stepped onto the scene. The British actress – whose birthday is December 28 – has starred in films Alfie, Layer Cake, Casanova, Factory Girl, The Edge of Love, Hippie Hippie Shake, The Girl, Foxcatcher, and American Sniper, just to name a few. Her first-ever film was South Kensington, with Rupert Everett and Elle Macpherson.

Aside from being an actress, Sienna is also a model and fashion designer. The gorgeous blonde is known for her chic & impeccable style, often seen front row at fashion week or strutting down the red carpet at A-list premieres.

Sienna Miller has kept people smiling through her decades in show business. Scroll through the gallery to take a look at some of her best fashion moments in honor of her 42nd birthday on December 28!

1 of 13

Sienna Miller in 2023

Sienna Miller in 2023
David Fisher/Shutterstock

Sienna Miller showed off her bare baby bump at the Vogue World Spring Summer 2024 show during London Fashion Week on September 14, 2023. Sienna is expecting her second child with boyfriend, Oli Green.

December 28, 2023, 12:05PM
2 of 13

Sienna Miller posing

Sienna Miller posing
Michael Buckner/Deadline/Shutter

Sienna Miller glows while pictured at the Deadline Sundance Studio presented by Hyundai in Park City, Utah on January 25, 2020.

February 26, 2020, 2:28PM
3 of 13

Sienna Miller at the ‘Wander Darkly’ Premiere

Sienna Miller at the ‘Wander Darkly’ Premiere
Alberto Reyes/Shutterstock

Sienna Miller looked gorgeous in this teal satin Etro wrap dress with gold details and a chunky oversized tan cardigan on top. She wore it at the Wander Darkly film premiere during Sundance Film Festival in Park City, Utah on Jan. 25, 2020. 

Sienna joked about her time in the tabloids with People in 2019. “I’m older and a little more boring,” she laughed. “Getting older is relieving. People are more willing to see you as a talented human being and not just something in a skirt. It’s a relief.”

February 26, 2020, 2:28PM
4 of 13

Sienna Miller at the 2020 Sundance Film Festival

Sienna Miller at the 2020 Sundance Film Festival
Taylor Jewell/Invision/AP/Shutte

Sienna Miller looked gorgeous while promoting her film Wander Darkly at the Music Lodge during the Sundance Film Festival in Park City, Utah. She wore a black sweater and tan skirt.

Talking about being a celebrity at the start of her career all the way back in Feb. 2007, Sienna said, “I don’t want to achieve fame. It has never been about achieving fame. I think that is something that gets put upon me.”

She went on, “If I wanted to be famous then I wouldn’t be doing the movies that I am doing. It’s not about fame and celebrity, that is really just one part of the culture of my job that I am uncomfortable with.

“I really genuinely love my craft. I am an actress that is what I do and if that comes with the territory that is fine.”

February 26, 2020, 2:28PM
5 of 13

Sienna Miller at the 2020 Golden Globe Awards

Sienna Miller at the 2020 Golden Globe Awards
Shutterstock

Sienna Miller stunned in this silk Gucci gown with a halter neckline and a keyhole cutout at the waist at the 77th Annual Golden Globe Awards in Los Angeles on Jan. 5, 2020. He frock also had a stunning bright yellow belt against a green skirt.

February 26, 2020, 2:28PM
6 of 13

Sienna Miller at a Screening of ‘American Woman’

Sienna Miller at a Screening of ‘American Woman’
Nina Westervelt/Shutterstock

Sienna Miller looked stunning in this long-sleeve sheer crystal dress with sheer black Gucci tights. She was at the American Woman special film screening after-party in NYC on Dec. 12, 2019.

Sienna joked about her impending mid-life crisis with The Telegraph in Aug. 2021, saying, “I keep waiting for this big existential crisis, but I don’t feel any anxiety about it. I feel quite proud of it in a way – like the older I get, the more settled I become. I’m looking forward to some wisdom.”

She went on, “I’ve led such an interesting life. If I look back on the past 20 years, I’ve had experiences I couldn’t have imagined – good, bad, ugly, beautiful. I feel like I’ve lived a million lives, and with that comes a sense of peace and acceptance. I just feel like I’m in a really good place. That sense of calm and tranquillity is something that I am grateful for, and I think that’s something that comes with age, and it’s something to be celebrated about getting older, for sure.”

February 26, 2020, 2:28PM
7 of 13

Sienna Miller at a Screening of ’21 Bridges’

Sienna Miller at a Screening of ’21 Bridges’
MJ Photos/Shutterstock

Sienna Miller looked fabulous in this long billowy floral-patterned Chloe gown with a pleated skirt & a mock neckline at the 21 Bridges film screening. It was at AMC Lincoln Square 13 in NYC on Nov. 19, 2019. 

Explaining how she became an It-Girl during the height of her fame in the late 2000s, she told Marie Claire UK, “I was just at the right place at the right time. I love fashion but I’m not obsessed by it. I love work, my style, but I don’t think only about that, even though some people want to believe the contrary.”

She continued, “I don’t wake up in the morning saying, ‘Hmm! What an icon I am!’ My life is very different; I’ve got a baby who leaves me only two hours of peace each night.”

February 26, 2020, 2:28PM
8 of 13

Sienna Miller at the 23rd Annual Hollywood Film Awards

Sienna Miller at the 23rd Annual Hollywood Film Awards
Matt Baron/Shutterstock

Sienna Miller was a ray of sunshine at the 23rd Annual Hollywood Film Awards at the Beverly Hilton in LA on Nov. 3, 2019. She was breathtaking in this off-the-shoulder yellow Cong Tri gown with a plunging slit on the side of her leg.

February 26, 2020, 2:28PM
9 of 13

Sienna Miller Stuns at the 2010 Met Gala

Sienna Miller Stuns at the 2010 Met Gala
Henry Lamb/Photowire/BEI/Shutter

Sienna Miller wows at the 2010 Met Gala, which was in honor of ‘American Woman: Fashioning a National Identity’. She wore a plunging sapphire blue frock to the event, which was on May 3, 2010.

Now a mom, Sienna joked that she can’t really keep up with trends. “I don’t know what the new fashion trends are! With my daughter, Marlowe, I don’t have time to follow this anymore,” she said to French magazine Figaro Madame.

December 28, 2021, 1:51PM
10 of 13

Sienna Miller Sizzles at Montblanc Charity Gala in 2009

Sienna Miller Sizzles at Montblanc Charity Gala in 2009
Matt Baron/BEI/Shutterstock

Sienna Miller looks like a bombshell in silky pink at the Montblanc Signature for Good Charity Gala on Feb. 20, 2009. The beauty beamed while wearing her blonde tresses in a sexy half-up, half-down style.

December 28, 2021, 1:50PM
11 of 13

Sienna Miller at the British Academy Film Awards in 2007

Sienna Miller at the British Academy Film Awards in 2007
Stuart Atkins/Shutterstock

Sienna Miller looks breathtaking in a backless Ungaro dress at the Orange British Academy Film Awards in London on Feb. 11, 2007. She paired the pistachio-hued mermaid-style frock with smokey eyes and golden blonde locks.

December 28, 2021, 1:50PM
12 of 13

Sienna Miller Glows at the 2007 Golden Globes

Sienna Miller Glows at the 2007 Golden Globes
David Fisher/Shutterstock

Sienna Miller looks like a golden girl as she arrives at the 64th Annual Golden Globe Awards on Jan. 15, 2007. Her Marchesa dress featured a gold brocade bodice with a flowy white skirt. Sienna complemented the gown with a crown of braids.

December 28, 2021, 1:50PM
13 of 13

Sienna Miller Wows at the 2005 Venice Film Festival

Sienna Miller Wows at the 2005 Venice Film Festival
Agf/Shutterstock

Sienna Miller turns heads at the premiere of ‘Casanova’ at the 62nd Venice Film Festival on Sep. 3, 2005. Her strapless Roland Mouret dress was made from a flowy, steel-blue silk. She twisted her hair into a chic bun and wore a stunning collar of diamonds around her neck.

December 28, 2021, 1:51PM
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