SHE'S known as 'the Queen of Christmas' and defrosts every winter to bring back her hit single All I Want For Christmas Is You.
But the song, released three decades ago in 1994, isn't the only thing consistent with the talented singer - it's also her age-defying looks.
The ageless beauty is often praised for her eternal glow and youthful facial features.
She's often joked about ageing and clearly sees it as a celebration.
In an interview with the Observer, via Attitude Magazine, she joked about her age when questioned about her first US Number One single, Vision of Love, released back in 1990 that she was 'nearly 25 years old' in 2017.
"First of all, don't round up. If you're going to round, round down!" the hitmaker said.
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"I don't count years, but I definitely rebuke them – I have anniversaries, not birthdays, because I celebrate life, darling."
So how does the singer look like she's barely aged despite being 55? Here, we take a look at her top beauty secrets.
Strike a Pose
The singer has often spoken about her beauty secrets from never smoking to finding the right angle.
The star has frequently joked about her 'bad side' with fans, after in 2016 revealing that she was told to favour one side of her visage when she was only 19.
She recalled the moment on her docuseries Mariah's World, she said it was her first ever shoot, and a photographer said her right side was her 'good side'.
"This is your good side," they allegedly said. "Only let people photograph you from your good side. Ever."
And that's what Mariah did for years, reportedly not allowing photographs of her 'bad side' - but she eventually leaned into it.
In 2009, speaking to the Associated Press - as shared by Yahoo! - she revealed: "I don't feel like, "Oh, I have to be on this side, or I have to be on this side." I really had specific things that someone told me when I was 19 starting in the business and I listened to them. I don't care anymore."
She also said it was all about lighting, sharing her griviances with overhead lights.
Speaking recently on the Las Culturistas podcast with Bowen Yang and Matt Rogers, she voiced her grievances.
'I can't with the overhead lighting. Why do they do it to us? I shouldn't say us, it's not us. It's me,' Mariah remarked.
'I'm the one who's the most tortured by the hideous lighting in every elevator, doorways, gyms - not that I go to the gym. But I'm just saying, it's hideous lighting.
Mariah Carey shares behind the scenes video showing moments before her 'angelic' AMAs performance
Suds Up
While Mariah may rely on lighting and angles to look her best on the red carpet, she also has some at home remedies she thanks for her flawless skin.
Speaking to the Guardian in 2018, Mariah clarified an interviewer's question about whether it was really true that she only bathed in French mineral water?
"No, I bathe in milk," she revealed. "Yes, sometimes I use milk as a beauty treatment. I don't want to give away all my secrets... Cold milk."
Thankfully, it's a much easier and budget-friendly treatment to try for yourself with milk costing 85p in Asda.
Some studies reveal the lactic acid found in milk can help exfoliate the skin leaving it soft and smooth.
Keep it Simple
Along with her bizarre bath ritual, Mariah, who loves to look glam, revealed the one make-up product she loathes - mascara.
Speaking to US Weekly, Mariah admitted that she 'hates' mascara. 'Whenever a makeup artist tries to put it on me, I throw a fit,' she added.
She also told Vogue: “If you’re not wearing a lot of makeup, you don’t have to take a lot of it off.
“So, my goal is to wear the least amount of makeup possible so I don’t have to steam my face and take it all off.”
More on Mariah Carey
WITH December finally here, here's everything you need to know about Christmas legend Mariah Carey.
Mariah was born in New York on 27 March 1969.
Her debut album Mariah Carey was released in 1990, with her signature song All I Want for Christmas Is You in 1994.
She has sold over 200 million records worldwide and has five Grammy Awards.
She has 19 Billboard Hot 100 number-one singles.
Singing aside, she's also been involved in numerous charitable causes, including the Make-A-Wish Foundation.
She's also starred in films such as Glitter and Precious.
Strict Diet
Mariah has also been candid about how she keeps her toned physique, adding that she sticks with proteins and rarely touches carbs.
"It's really hard. My diet, you would hate it," she told E! News in 2016. "All you eat is Norwegian salmon and capers every day. That's it.
"I'm actually serious... I try to stick with the proteins. It's the worst."
Beauty Sleep
As well as taking her diet seriously, Mariah says she doesn't play around with her beauty sleep either.
Not only is it reported that Mariah sometimes sleeps for 15 hours a night, but she even hires a masseuse to help relax her so that she can get to sleep easier.
In fact, a US Weekly report once claimed that the artist paid a masseuse $1,500 to massage her for eight hours, while she slept.
The star explained that on nights when she struggles to sleep: "I’ll get a masseuse to come, to make it a relaxed atmosphere.”