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Shameik Moore, star of "Spider-Man: Into the Spider-Verse," was one of a number of male guests to eschew black-tie tradition.
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"Crazy Rich Asians" star Gemma Chan in a custom floral-print dress by Jason Wu.
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Cody Fern's dark Yohji Yamamoto jumpsuit featured a strategically placed cutout. He matched the daring outfit with a pair of white "goat" shoes by Maison Margiela.
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"BlacKkKlansman" star Laura Harrier in a white Louis Vuitton gown with silver embellishments.
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Timothee Chalamet paired a sleek, multi-colored suit by Alexander McQueen with white sneakers.
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Emmy Rossum wore a stunning velvet red Ralph Lauren gown, with vampiric lipstick to match.
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Boots Riley looked at home -- literally -- in this silky dressing gown-like outfit.
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Regina King stunned in a purple sequined dress before being named Best Supporting Actress for her role in "If Beale Street Could Talk."
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Ken Jeong's velvety pink jacket was bold, to say the least.
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Amandla Stenberg, star of "The Hate U Give," looked elegant in a flowy red gown.
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Best Director nominee Spike Lee kept things casual by pairing a quirky blazer with a baseball cap.
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Charlize Theron wore a metallic one-shoulder Givenchy dress featuring a two-toned skirt.
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Awards host Taye Diggs arrived in a dapper tuxedo.
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Chrissy Teigen and John Legend attend the 24th annual Critics' Choice Awards. Teigen wore a glamorous ivory gown with a high thigh slit and Legend wore a sharp dark brown suit and turtleneck.
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Nicole Kidman stunned in a strapless black-and-white dress by Armani Prive.
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"Crazy Rich Asians" actor Harry Shum Jr. sported a suave sparkling blazer by Roberto Cavalli.
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"Killing Eve" actress Jodie Comer attends the 24th annual Critics' Choice Awards in Zurhair Murad.
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Emily Blunt wore a Prada gown, while husband John Krasinski opted for a white jacket over a black shirt.
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Lady Gaga wore a strapless pale peach Calvin Klein gown with a short train.
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Maggie Gyllenhaal chose a more classic look with this floor-length golden gown.
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"Crazy Rich Asians" Constance Wu arrived in a sparkling light pink gown by Rodarte.
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Amy Adams paired a blue long-sleeved dress with emerald green statement earnings.
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Allison Janney went for an all-white ensemble with a draped blouse.
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Elsie Fisher owned the black tuxedo look, with the 15-year-old "Eighth Grade" star complementing it with brogues and a tiny bag.
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"Roma" star Yalitza Aparicio in a pink gown by Prada.
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Claire Foy attends the 24th annual Critics' Choice Awards in a semi-sheer one-shoulder top and trousers.
CNN  — 

Awards season is fully in swing, with Hollywood’s finest descending on Santa Monica for the 24th Critics’ Choice Awards Sunday evening.

The annual ceremony, which honors the year in film and television, has historically offered some pretty substantial clues about who might win big at the Oscars. It’s also a more relaxed affair than other dates on the awards calendar, a mood reflected on this year’s red carpet (or blue carpet, to be precise).

After the fairytale dresses and classic Hollywood glamour of last week’s Golden Globes, many attendees opted for pared-down looks at Santa Monica’s Barker Hangar. Even Lady Gaga, who stole the show at the Globes with an extravagant Valentino dress, kept things simple this time around with a strapless pale peach Calvin Klein gown and (comparatively) short train.

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Lady Gaga wore an understated Calvin Klein gown.

Elsewhere, bold silhouettes made way for more conventional, often figure-hugging, choices. But this didn’t prevent stars from turning simplicity into understated elegance. Emmy Rossum turned heads in a plunging burgundy Ralph Lauren gown, while Amy Adams stunned in a blue long-sleeved dress paired with emerald green earnings.

But if the female stars were saving their statement pieces for the Oscars, now just six weeks away, the men treated the Critics’ Choice Awards as license to experiment.

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Timothee Chalamet wore a suit by Alexander McQueen.

Suits and tuxedos appeared in all manner of unorthodox colors and textures, from Ken Jeong’s velvety pink jacket to the fetching dark teal number worn by Shameik Moore of “Spider-Man: Into the Spider-Verse.” Elsewhere, “Crazy Rich Asians” star Harry Shum Jr. shone – literally – in a suave sparkling blazer by Roberto Cavalli.

Among the most adventurous male stars were rapper and director Boots Riley, who showed up in what can only be described as a dressing gown, and “Beautiful Boy” actor Timothee Chalamet, who paired a sleek, multi-colored suit by Alexander McQueen with white sneakers.

Cody Fern, who made headlines with his sheer top at the Globes, opted for a dark jumpsuit with a cutout revealing a streak of torso. The Australian once again matched his daring outfit with a pair of “goat” shoes (which last week set social media alight), though in white this time.

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Harry Shum Jr. and Gemma Chan at the 24th annual Critics' Choice Awards.

But the women weren’t to be outshone, and the evening still yielded an array of show-stopping gowns. Wearing some of the night’s biggest looks were “Crazy Rich Asians’ star Gemma Chan, who lit up the awards in a voluminous custom floral-print dress, and Charlize Theron, whose breathtaking metallic Givenchy dress with two-toned skirt shimmered as she walked the blue carpet.

Scroll through the gallery above for some of the night’s best fashion. CNN’s Stephy Chung, Oscar Holland and Jenny Kerrigan contributed to this report.