Look back at birthday girl Diane Keaton's most iconic style moments

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One of our favorite things about Diane Keaton? Her totally unique and incredible style. From turtlenecks to hats to gloves, the star's signature fashion has stayed consistent for decades! In honor of her 78th birthday on Jan. 5, 2024, Wonderwall.com is taking a look back at her most memorable fashion moments through the years… starting with this chic ensemble…

Diane Keaton accessorized her Gucci suit with a black beret at the 2021 LACMA Art+Film Gala.

Keep reading to get a better look at her midnight blue sequined suit in motion, then check out more of her most fabulous looks…

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Diane Keaton looked incredible in a midnight blue sequined suit at the 2021 LACMA Art+Film Gala.

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We love how she accessorizes! Diane Keaton layered multiple silver cross necklaces when she attended the premiere for her show "Green Eggs and Ham" in Los Angeles in 2019.

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A bow tie, a long jacket, velvet gloves and a wide-brimmed hat set this look apart for Diane Keaton, who embraced many elements of her signature style as she arrived at an event honoring media magnate Sumner Redstone in 1998. 

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She's always loved a good menswear-inspired moment, and Diane Keaton delivered with this three-piece suit she wore to the 2004 Academy Awards. From the pinstripes and killer tuxedo shoes to her signature gloves and that top hat, we loved it all.  

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The chicest! Diane Keaton attended the Ralph Lauren Spring/Summer 2023 runway show at the Huntington Library in San Marino, California, in 2022 in this sharp twist on her personal style — a black satin lapel tuxedo coat worn over a white high-necked button-down blouse and wide-legged trousers. A black hat topped things off, cementing her as the most stylish 76-year-old on the planet.

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Diane Keaton loves plaid. She wore a pop of the bold pattern at the 2004 Academy Awards nominees luncheon where, underneath her crisp white skirt suit, she added a high-necked red-and-black plaid blouse then coordinated that pop of color with red gloves and pointy-toed heels. 

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A full-length turtleneck Ralph Lauren gown? Only Diane Keaton could pull this one off! The star donned the black long-sleeved slinky frock at the L'Oreal Legends Gala Benefit for the Ovarian Cancer Research Fund in 2006. 

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Check out this white moment! Diane Keaton arrived at the 2004 Golden Globes in style wearing this sleek look — a dress featuring a high collar accessorized with white gloves, pearls and pointy-toed boots. 

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Fifty shades of brown! Diane Keaton donned a lot of taupes and chocolate browns at the People Concern's Celebrating Change Gala in 2018. From her tan suit and cocoa-colored turtleneck to her mahogany belt and rich caramel-hued wide-brimmed hat, Diane experimented with all sorts of shades.

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Diane Keaton arrived at the premiere of "The Family Stone" back in 2005 in a tuxedo complete with a bow tie. The sleek black look was years ahead of its time — Diane was doing it long before menswear-inspired red carpet trends were all the rage. 

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Diane Keaton rocked a belted gingham dress with some unique accessories at the "Poms" premiere in 2019. She rocked a matching gingham scarf around her neck, fingerless gloves and some trendy black boots with white laces. 

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She's even chic with her feet in cement! In 2022, Diane Keaton was honored with a hand and footprint ceremony at the TCL Chinese Theatre in Hollywood — and she certainly showed up in style. The icon donned her signature black hat, a black-and-white printed blouse and wide-legged white trousers fastened with a black belt, remaining true to her usual color palette.

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Diane Keaton attended the premiere of "Green Eggs and Ham" in 2019 in this sleek plaid pantsuit, which she smartly paired with a black turtleneck and chunky black boots. She accessorized with mounds and mounds of silver chains with cross charms to finish of this fab look.

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In 2010, Diane Keaton rocked this funky and fabulous Marni frock at the annual Women in Hollywood Tribute. It featured black, blue and brown embellishments that delivered a unique color palette, and she paired it with black tights and heels. 

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Back in 2014, Diane Keaton sported a different gingham look — a blazer featuring the pattern atop a white dress shirt and black pencil skirt. She finished things off with a pair of slouchy socks and heels.

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At the "Mad Money" premiere in 2008, Diane Keaton arrived in style in this shiny white suit. She rocked a ruffled white blouse underneath to complete the monochromatic look then added matching heels.

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A hat, gloves, tights and booties made this a Diane Keaton signature look. She added a simple little black dress to the mix to complete this ensemble that she wore to the Women of Worth event in 2013. 

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It was a black leather minidress for Diane Keaton at the 2010 premiere of "Morning Glory." She sported the chic frock with a black turtleneck underneath and added black tights and heels. 

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At the 2005 Golden Globes, Diane Keaton delivered a style twist, pairing a well-tailored striped suit jacket and fitted white dress shirt with a full-length tulle skirt.

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Diane Keaton rocked this plaid coat dress at the David di Donatello Award ceremony in 2018. When it came time to accessorize, she added a thick black belt, lace-up boots and a wide-brimmed hat. 

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Sometimes you just need to rock a statement heel! Diane Keaton kept most of her look monochromatic — a black knee-length dress and black beret — but added a fun pair of leopard-print shoes to spice up this fabulous ensemble she donned for the "Darling Companion" film premiere in 2012.