Jennifer Aniston has looked incredible on every red carpet with her age-defying appearance, and now her facialist has revealed the secrets to her youthful looks.

The Friends actress, 56, who is most famed for her role as Rachel Green in the American sitcom, has admitted to dabbling with cosmetic procedures to keep herself looking youthful.

And while she may have enjoyed a few tweakments over the years, Jennifer's aesthetician, Joanna Czech, has revealed that many A-listers prep a staggering six weeks in advance before making a big Hollywood appearance.

The skincare expert, who is one of the industry's most trusted facialists, explained that big stars, such as Jennifer, will 'change their lifestyle' and follow a 'precise facial regime' in the weeks leading up to an event.

Speaking on LYMA's latest Power Women episode, a wellness and beauty brand that specialises in laser, Joanna said: 'Proper red carpet prep usually takes six weeks.

'They change their lifestyle, step up workouts, get slimming massages, and follow a precise facial routine. It's not instant, it takes time.'

Jennifer Aniston, 56, has looked incredible on every red carpet with her age-defying appearance, and now her facialist has revealed the secrets behind her youthful looks

The Friends actress, 56, who is most famed for her role as Rachel Green in the American sitcom, has admitted to dabbling with cosmetic procedures to keep herself looking youthful

Joanna revealed that many of her clients, who have included Anna Wintour and Hailey Bieber, all have the same concerns.

She explained that many clients have 'loosened jaw situations', which can be caused by getting Botulinum toxin injections, a common brand includes Botox.

'I see a lot of hyperpigmentation and loosened jaw situations, but that has to do a lot with other decisions that we've made', she explained.

'Everything is connected, so if the largest muscles are frozen, then things are getting a little weaker.'

The facialist also warned that fillers can be 'a disaster' when overused because they can lead to unnatural changes in facial shape.

Botulinum toxin is a neurotoxin that can temporarily paralyze muscles and fillers are most often injectable hyaluronic acid, which are injected beneath the skin to restore lost volume and smooth out wrinkles.

Over the years, Jennifer has been consistently praised for her ageless beauty and was crowned People's Most Beautiful Woman of the year in 2004 and 2016.

And while Jennifer has not fully disclosed every tweakment and routine, she has opened up about one surgical procedure and shot down rumours of others.

The skincare expert explained that big stars, such as Jennifer, will 'change their lifestyle' and follow a 'precise facial regime' in the weeks leading up to an event

Speaking to LYMA, a wellness and beauty brand that specialises in laser, Joanna said: 'Proper red carpet prep usually takes six weeks. 'They change their lifestyle, step up workouts, get slimming massages, and follow a precise facial routine. It's not instant, it takes time.'

She has previously confirmed that she underwent a rhinoplasty in her 20s to correct a deviated septum caused from a broken nose during her high school years.

Speaking to People in 2007, she said the operation was the 'best thing I ever did', adding: 'I slept like a baby for the first time in years'.

Read MoreEXCLUSIVE Experts weigh in on how Jennifer Aniston has maintained youthful looks without going under the knife

But she added: 'As far as all the other [rumours], as boring as it sounds, it's still mine. All of it. Still mine.'

Jennifer has also shot down rumours that she underwent breast augmentation, stressing in 2006: 'No boob job! You know what it's called? It's called 10 pounds.'

She added: 'Here's what it is, this is the funny thing, you're either, "Oh, look at the bump," and they circle the bump and there's an arrow. But instead, it's like, you know, maybe a couple cheese plates too many.'

Previously the Golden Globe winner has admitted that she's tried Botox in the past and wasn't a fan.

In 2015, she told Yahoo Beauty: 'People think that I do a lot of [Botox] injections, but I don't. I'm not saying that I haven't tried it, but I see how it's a slippery slope.

'All that cosmetic stuff looks ridiculous on me. And like we were saying before, they just start to lose perspective, it's their new normal, so it's a hard one to come back from.'

In an interview with Harper's Bazaar Australia in 2014, Jennifer said she felt sorry for women who felt pressure to get injections to stay looking young, saying they ended up looking the opposite and so she was able to learn from their errors.

She has previously confirmed that she underwent a rhinoplasty in her 20s to correct a deviated septum caused from a broken nose during her high school years (pictured in 2000)

She explained: 'There is this pressure in Hollywood to be ageless. I think what I have been witness to, is seeing women trying to stay ageless with what they are doing to themselves.

'I am grateful to learn from their mistakes because I am not injecting s*** into my face. I see them and my heart breaks. I think, "Oh god, if you only know how much older you look."

'They are trying to stop the clock, and all you can see is an insecure person who won't let themselves just age.'

Read More Jennifer Aniston looks impossibly young as she turns 56

Instead, Jennifer has extolled the benefits of peptide injections - strings of molecules called amino acids, which are the 'building blocks' of proteins.

According WebMD, peptide supplements may have anti-aging, muscle growth, and fat loss benefits.

She has also expressed her love for high-tech skincare treatments, such as the CACI laser facial -- a kind of non-surgical facelift.

In 2016 Jennifer explained: 'I love lasers and Thermage and Ultherapy [ultrasound facials]. I also like a good microcurrent facial.'

Ultherapy uses ultrasound waves to tighten the skin from the inside and is said to be excruciating, but Jennifer described it as 'like a little workout for your face'.

She also uses laser treatments to reduce her facial wrinkles or acne scars and said they were 'a great refresher'.

In 2023 Jennifer revealed one of the most unconventional fads that she's tried out to stay looking good.

She admitted that she is always up for trying out new anti-aging techniques, including receiving a salmon sperm facial, on an aesthetician's suggestion.

Salmon sperm has been hailed as the next must-have Korean beauty ingredient, with the promise to increase cell turnover, produce more collagen and improve pigmentation and inflammation.

Recalling the experience, Jennifer told The Wall Street Journal: 'First of all, I said, 'Are you serious? How do you get salmon's sperm?''

Jennifer pairs that with a five-days-a-week workout regime which is cardio intense, while she also attends 10-to-20 minute Pvolve classes.

But the Hollywood star admitted that she didn't feel like the facial did anything to help improve her skin's youthful glow.

Instead, she explained that she does swear by weekly peptide injections to combat the effects of aging and stated: 'I do think that's the future'.

Jennifer also said that she hated being told she 'looked good for her age' instead of just 'you look great'.

She admitted to British Vogue: 'It drives me bananas. I can't stand it. That's a habit of society that we have these markers like, "Well you're at that stage, so for your age..." I don't even understand what it means.

'I'm in better shape than I was in my twenties. I feel better in my mind, body, and spirit. It's all 100 per cent better.'

As far as maintaining her slender and toned figure, Jennifer has an intense daily workout routine and does intermittent fasting to stay at a reported 117lbs and size two.

She has previously said that she has been conscious about her health from an early age, focusing on clean eating, drinking water, prioritising sleep, meditating and working out to ensure she feels her best.

The Emmy winner has been committed to a healthy and holistic lifestyle and follows a high-protein, low-carb and low-sugar diet.

Jennifer pairs that with a five-days-a-week workout regime which is cardio intense, while she also attends 10-to-20 minute Pvolve classes.

Speaking to the Radio Times, she revealed that intermittent fasting (IF) has changed her life and she practises a version of IF called the 16:8 diet.

She said: 'I do intermittent fasting, so no food in the morning. I noticed a big difference in going without solid food for 16 hours.'

But, Jennifer has admitted that she allows herself to ditch her clean diet on Sundays and likes to invite her friend over to enjoy homemade In-N-Out burgers.

And she also revealed that she does have one major bad habit when it comes to food - a tendency to 'over salt things'.

While she is also particular about the pimiento-stuffed olives she allows in a dirty martini. She even carries them around with her when she's traveling.

One thing Jennifer no longer allows to affect her eating habits are 'thin fads' however. She explained: 'They don't interest me. Because I know what that is all about. That's just calories in, calories out.'

Her go-to salad famously went viral on TikTok in 2022, with the Along Came Polly star revealing the real recipe.

While speaking to the Today show, she detailed her favourite salad order, which starts with butter lettuce as a base.

She added: 'I love to have some mushrooms. I love sprouts. I love a little tomato. Avocado, Kalamata olives, always some cheese - never gonna give up my cheese. I'll do sliced parmesan, pecorino ... feta ... or all of them!'

The actress tops off her salad with sliced almonds or sunflower seeds for crunch and either a chopped or poached egg for protein.

As for the dressing, it depends on the day, with her typically opting for oil and vinegar or a vinaigrette, but if it's the weekend, she might have ranch instead.

Jennifer Aniston's facialist reveals red carpet skin prep secrets