A plastic surgeon told us exactly what's going on with Hollywood facelifts.

Something has been going on in the world of celebrity faces.

The likes of Kris Jenner, Demi Moore, and Lindsay Lohan have all stepped out with refreshed complexions, prompting a multitude of questions about what exactly is going on in the world of the Hollywood beauty industry.

Whatever it is, these procedures look almost undetectable.

Enter: Dr. Catherine Boorer.

She is one of Sydney's few female plastic surgeons, and is here to tell us the secrets behind these dramatic transformations and alleged facelifts.

"I want people to realise that a facelift is a very invasive medical procedure," said Dr. Boorer on Mamamia's You Beauty podcast.

"I think sometimes people see it as an extension of a beauty treatment, like a facial, and think 'I'll just have a quick facelift.' Social media tends to play into that a little bit, but it is a serious medical procedure, which is quite invasive and does carry risks. So it's important to take that on board."

Watch: Garett and his mum Dalene on getting cosmetic surgery in Türkiye. Post continues below.

While celebrities stroll out onto the red carpet, looking years and years younger, the reality is that facelift surgery is incredibly delicate and tedious.

"Especially in a deep plane lift, just under that deep plane are all the nerves, they're called the facial nerve, that work the muscles of facial expression," the plastic surgeon explained.

"So every time you smile, crinkle your eyes, wriggle your nose, those are called the muscles of facial expression. And the nerves that motor those muscles are directly underneath the layer we're lifting."

Any damage to the facial nerve could lead to "temporary or permanent problems with facial expression".

"There can be damage to the skin or even death of the skin because of poor blood supply. There can be asymmetries in terms of the way one side is slightly tighter than the other."

Listen to the full You Beauty episode with Dr. Catherine Boorer below. Post continues afterwards.

One of the biggest fibs celebs tell us (by omission) is how quick and easy recovery is. They disappear for a few weeks and emerge with a fresh face, as if they just went on a juice cleanse in Bali. The reality? Not so Instagram-worthy.

"I think you would need a minimum of at least six to eight weeks to be able to walk out with cameras on you, because you'd be so puffy," Dr. Boorer said.

Using Kris Jenner as an example, the plastic surgeon said the 69-year-old "probably has access to Omnilux or light therapy at home, that is good for recovery.

"She would have access to so many things to help speed up her recovery, but there is only so much that those things can speed it up," she adds.

For most of Dr. Boorer's patients, it takes four months "before they start to feel human or like their usual selves, because the skin can feel numb for a very long time".

As for how much money these stars are spending on their new faces, Dr Boorer says that as there's no set fee in cosmetic surgery, there's no fee regulation.

"As a baseline, people charge what they need to charge to cover costs of running a business and then make a profit, just like any other business," she said.

"The more specialised and renowned you get for a particular procedure, the market allows you to charge more and more."

For example, Dr Steven Levine — who is allegedly responsible for Kris Jenner's 'transformation' — charges a minimum of $45,000 USD (about $70,000 AUD).

For regular Aussies considering similar work, we're looking at a starting fee of around $30,000 up to $100,000.

"But it also depends on the type of facelift and any ancillary procedures you may be having, like, for example, fat grafting and eyelid procedures," said Dr. Boorer.

While celebrities Kris Jenner and Demi Moore are in their 60s, the age of Hollywood stars reportedly going under the knife is getting lower and lower.

This is something Dr. Boorer has noticed in her own practice.

She puts it down to social media.

"It feels like we're bombarded with images of ourselves," she said. "We're looking at ourselves constantly, and we notice these changes.

"Then when you compare that to a celebrity in your age group, you think, 'Well, why can't I look that good?' Or 'There's something wrong with me if I don't look that good.'"

When younger patients come to her wanting work, she's refreshingly blunt.

"I'll tell them, 'You don't need it.' I will certainly give them the time. I'll do an assessment, I'll talk to them about the things that are concerning them. And I'll try to put it into context with where I think they are in terms of the general population for their age, and most of them are gorgeous."

Though the facelift craze has taken off, as they are "great for gravitational effects with jowling, deep nasolabial folds", the plastic surgeon said there are some cheaper options.

"Depending on the depth and the degree of ageing, sometimes filler can, for example, camouflage that to a certain point because it's very easy to go overboard, and you see people who have gone way too far down that pathway, and then they start looking weird," she said.

Sometimes patients will ask Dr. Boorer for the one thing she would do for their face.

"A lot of times it could be just doing an upper blepharoplasty, which might be less than $10,000 all up," she said.

"Taking the heaviness out of someone's eyes, making them look more awake and fresh is, I think, one of the best "bang for buck" procedures there is."

Feature Image: Getty/Instagram/@drcatherineboorer