Months of work goes into prepping for a big event (Picture: Getty/AP)

Beauty insiders say A-listers have been prepping for the Met Gala for as long as half a year – so don’t feel bad if your once-a-week exfoliating mask isn’t delivering the same results.

Wanting the glowiest, healthiest-looking skin means celebrities are spending tons on their facial routines – and we’ve got the inside deets now.

Kate Kerr, aesthetic facialist and director of Kate Kerr London Clinic, known for their residency at the prestigious Agua London spa, has shared how far celebrities prep in advance depends on the condition of their skin to begin with.

She tells us: ‘If their skin is in good condition, they’re using good cosmeceutical or medical grade skincare and their skin is likely to be functioning really well.

‘They just might need a few facials – I’d say on an average of two skin cycles before (12 weeks) just to target any concerns and really brighten the skin, even out any discolouration and ensure optimal hydration for the day.’

So even if ‘minimal’ work is done, that person is likely using top-notch, even medical-grade products already.

What does the celebrity pre-red carpet skincare regime look like?

Leading up to the event, there would be a course of facials targeting pigmentation, to brighten and plump the skin.

At Kate’s clinic, she uses radio frequency to help tighten and lift, once a week for six weeks.

She says: ‘I’d recommend having a facial two weeks before a big event, then ideally the day of or the day before, but a non-irritating more red carpet lifting facial.

‘If not, you could do a DIY facial the morning of it.

‘We often give our clients their last pre-event facial two or three days before a big event, because they can’t get in sooner, and the night before they might wear our ZO Enzymatic Peel mask overnight – using lactic acid to exfoliate, hydrate and plump the skin.

‘Then they’d wake up in the morning, wash it off and apply a sheet mask to plump the skin up.’

However, if someone’s skin isn’t functioning well, and they’re not looking after it, Kate reveals some A-listers are preparing four to six months ahead – that’s half a year, just for the Met Gala.

‘This is because we don’t know how long it will take to break the skin out, repair any damage or if you’ll get any adverse effects in the beginning that you need to work through,’ she explains.

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‘You’ll want to work at least four or five cycles ahead on the skin.

‘And if you’re wanting collagen induction to really plump up the skin and fine lines and wrinkles, it’d be at least six months before.’

To treat skin scarring or change the texture of the skin, Kate says they’d need to do collagen-stimulating treatments and at least six months before.