31 Best dressed stars this month: Mariah Carey, Rihanna, Bella Hadid, more

Mariah Carey is thriving, days after her split from Bryan Tanaka was confirmed. The songstress – who recently wrapped her Christmas tour in New York – is spending the holidays in Aspen, Colorado, and debuted a glamorous post-break up hair transformation to complete her chic skiwear look.

Rihanna looked eclectic as she rocked her signature 'Fenty purple' in a pair of low-slung jeans and an oversized lilac cropped jacket as she attended the Fenty x Puma Creeper Phatty Launch Party in Los Angeles this month. 

The singer looked so stylish in the perfectly coordinated ensemble, opting for a white slogan cami top with a lace trim and a purple leather biker jacket beneath her fluffy coat. 

Bella Hadid has earned her stripes as the style muse of her generation, both on and off the runway. 

The 25-year-old model stepped out in NoHo, New York ahead of the holidays in an effortless street style ensemble that served up a 70s inspired vibe. 

Nicole Kidman was a vision of ethereal beauty in a Champagnue-hued corseted gown at the screening of "Expats" at Palace Verona on 20 December 2023 in Sydney. 

The Australian star let her strawberry-blonde hair fall into natural curls as she wore it in an elegant updo. 

READ MORE: Nicole Kidman is utterly incredible in nude corseted gown with thigh-split

Sydney Sweeney was a vision in a sheer dress to attend the Australian screening of her new rom-com Anyone But You.

The blonde bombshell's loosely draped gown boasted a wrap-over front and a glamorous cowl back. Gorgeous! 

Margot Robbie looked effortlessly chic in an oversized blazer and slouchy jeans as she attended a special screening of Saltburn in Los Angeles. The actress complemented the low-key look with a pair of heeled boots, as she mingled with the film's star Rosamund Pike and producer Josey McNamara.

Emma Stone looked stunning when she graced the red carpet at the Poor Things UK gala screening, hosted at London's Barbican Centre. Channeling regency glamour in a cornflower blue stole layered over a backless, silver slip dress crafted out of beautiful silk, the actress promoted her hotly-anticipated new film in style.

Oprah Winfrey dazzled her way through New York City as she was seen leaving the Empire State Building in a monochromatic purple outfit. 

Make a case for lace, Jenna Ortega looked angelic in white at the Los Angeles Premiere of Paramount+'s 'Finestkind' at Pacific Design Center on 12 December. 

The 'Wednesday' star's sheer blazer dress featured a corseted design and structured skirt, which she paired with platform Mary Jane heels.

Carey Mulligan was an ethereal beauty at the photocall for Netflix's 'Maestro' on 12 December as she danced onto the red carpet in a glittering navy gown. 

Lady Gaga shone in sharp tailoring as she joined Carey Mulligan and Bradley Cooper at Netflix's 'Maestro' Los Angeles Photo Callon 12 December. 

The Grammy Award-winning artist opted for a deep plunging blazer adorned with woven motfis, styling her platnium blonde hair in 1920s-inspired waves. 

George and Amal Clooney graced the red carpet at the Los Angeles premiere of 'The Boys in the Boat' on 11 December. 

Amal, who is no stranger to a sublime sartorial moment, made a statement in an electric yellow corseted gown and she let her glossy chocolate tresses fall to her shoulders in loose curls. 

Euphoria's Sydney Sweeney chanelled Gossip Girl's Blair Waldorf as she teamed a fitted tailored waistcoat with a satin headband, adding to her effortless ensemble with wide-leg denim jeans. 

The star was spotted in Midtown Manhattan on 11 December. 

Timothée Chalamet donned a Wonka coded chocolate-hued patent trouser suit at the Los Angeles premiere of his new movie. 

Kelly Rowland made a sartorial statement at the Los Angeles premiere of Wonka as she embodied the iconic character's signature eccentric style in a polka dot bodysuit and wide-leg trousers, accessorising with 'TV room' style goggles. 

Days after turning heads at The Fashion Awards 2023 in a black bodycon dress from Primark, Rita Ora rocked a riotous ruffled look at Capital's Jingle Bell Ball in a sheer glittering dress adorned with dramatic tulle embellishments. 

Amanda Seyfried glittered in an off-the-shoulder emerald dress at the 17th Annual CNN Heroes: An All-Star Tribute at The American Museum of Natural History on 10 December. 

Leigh-Anne Pinnock glittered onto the red carpet at Capital FM's Jingle Bell Ball on Saturday 9 December, looking breathtaking in an ethereal sheer dress adorned with all over crystals.  

Jodie Turner-Smith had a spellbinding presence at the 'All Of Us Strangers' premiere in Los Angeles, teaming structured tailoring with artsy design as she rocked a decontructed shirt and trouser combination. 

Andrew Scott looked opted for a bold turquoise suit and pussy-bow shirt at the 'All Of Us Strangers' special screening in Los Angeles on 9 December. 

Julia Fox takes the crown as the queen of eclectic dressing. Stepping out in Los Angeles this month, the 'Uncut Gems' actress teamed thigh-high leather boots with a coquette coded ruffled skirt and a two-tone sweater. 

Emma Stone was a beguiling beauty in a bejewelled buttercup yellow gown at the premiere of 'Poor Things' in New York City.

Taylor Swift embodied Carrie Bradshaw's confidence as she joined a fleet of stars at the after party for the 'Poor Things' in New York City. 

Looking sophisticated in monocrhomatic black, the musician layered a black column dress with a dramatic fur coat and towering black heels, sticking to her signature beauty combo of a berry red lip and bouncy curls. 

Rihanna made a case for bump-bearing couture when she debuted her and A$AP Rocky's first pregnancy in 2022. One year later, pregnancy has become the red carpet's best accessory - and Ciara was the latest star to follow suit. 

The 'Level Up' singing, who is expecting her fourth child, highlighted the beauty of pregnancy at the premiere of 'The Colour Purple' on Wednesday 6 December by wearing an open white shirt and covering her blooming bump in gold glitter. 

It's clear to see 'The Little Mermaid' star Halle Bailey is continuing to carry on her Disney Princess legacy on and off the screen. 

On Wednesday 6 December, Halle was a lady in red as she graced the premiere of 'The Colour Purple' in a frothy cherry red gown. 

Natalie Portman opted for sharp tailoring as she stepped out in London to promote her new film, 'May December'. 

The Academy Award-winning actress' power suit featured romantic structured shoulders and a plush velvet fabric laced with elegant satin lapels. 

SEE: Natalie Portman reveals awkward question asked by King Charles during her teens

Willow Smith rocked an all-black androgynous ensemble on the black carpet of the GQ Australia Men Of The Year Awards in association with BOSS on Wednesday 6 December. 

The 23-year-old paired an open black blazer with layers of silver chains and a deep plum lipstick.

Troye Sivan was the definition of 'suited and booted' at the GQ Australia Men Of The Year Awards in association with BOSS at Bondi Pavilion. 

Dressed in a crisp, white, three-piece suit and a Prada béret, the 'Rush' hitmaker perfected effortless dressing at the star-studded event.

Billie Eilish departed from her signature slouchy streetwear in favour of a layered and deconstructed trouser suit to support her friend Claudia Sulewski's sustainable bodycare launch. 

Stepping out to celebrate CYKLAR at Solawave House in West Hollywood, the 'Happier Than Ever' hitmaker put her own spin on a preppy aesthetic. 

We can always trust Em Rata to serve up a streetwear style combination worthy of a runway. 

On 6 December, the model was spotted in NYC pairing a candy pink puffer jacket with boyfriend jeans and red Puma sneakers.

The Crown's Meg Bellamy looked enchanting in a custom-made column dress by Maison Valentino and Malone Souliers M-T-O Bespoke Mules at the season finale celebration on 5 December. 

The 21-year-old It-girl, who's seamless accension into the fashion world has been catapauled by her role as one of the best dressed women in the world, the Princess of Wales, opted for timeless glamour in monochromatic cream.