There is no denying that the royal ladies always manage to look picture-perfect. From the late Queen Elizabeth to Catherine, the Princess of Wales and Princesses Eugenie and Beatrice, these ladies always look glowing.

And yes, we know they have the funds to pay for the best makeup artists there are and can afford skincare regimes most of us can only dream of, however, did you know that the royals also have some pretty affordable beauty favourites?

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It's true. Behind the palace gates, here are the beauty buys that insiders have revealed have the royal stamp of approval:

Essie Ballet Slipper nail polish

Known for her dislike of bright nail polish, the late Queen Elizabeth was all about light, pretty pastels when it came to her manicures.

Her perfect polish? Essie’s ‘Ballet Slippers’, which has been her go-to for over 30 years, ever since 1989, when the Queen’s hairdresser wrote a letter to brand founder Essie Weingarten, specifically requesting a bottle of the pink-nude polish for Her Majesty.

It is even rumoured that Princess Beatrice wore it on her wedding day a couple of years ago – making this the ultimate royal polish pick.

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When it comes to the Princess of Wales, rumour has it that Kate's glowing skin is down to her favourite beauty bargain – Trilogy's Rosehip Oil.

"Kate continues to use rosehip oil in her daily skincare regimen," an anonymous source told US Weekly in 2015. "She loves the effect it has on her skin."

Packed full of antioxidants and essential fatty acids to restore moisture and plump skin from within, we love how Trilogy's cult facial oil all-natural and organic formula also has amazing anti-inflammatory properties, making it the perfect glow-inducing beauty booster.

Jo Malone Eucalyptus and Mint Cleanser

Everyone knows a good cleanser is the be-all-and-end-all of a good skincare regime – something Princess Eugenie is clearly well aware of.

Previously, the princess has revealed to Harper's Bazaar that she uses Jo Malone Eucalyptus and Mint Cleanser every single day before bed.

Bobbi Brown's Long-Wear Gel Eyeliner in Black Ink

We all know Kate loves a flick of eyeliner – and apparently, the newly named Princess of Wales is such a pro at doing her own eye makeup, she even did it for her wedding day!

According to insiders, Kate's favourite thing to use for a perfectly smudged smokey eye is a gel liner, and she has been known to use Bobbi Brown's Long-Wear Gel Eyeliner in Black Ink to create just the right amount of smoulder.

Elizabeth Arden 'Eight Hour Cream Skin Protectant'

Of course, the brand has never officially revealed which exact products you could find on the late monarch's bathroom shelf, but seeing as the warrant describes the ‘Eight Hour’ moisturizers as “iconic”, we suspect you’ll spot one of those at least.

Clarins ‘Instant Light Natural Lip Perfector in Rose Shimmer’

Trust the royals to create an instant sell-out.

A while back, the Princess of Wales was spotted applying the Clarins ‘Instant Light Natural Lip Perfector in Rose Shimmer’ while enjoying some summer sun at Wimbledon – and needless to say, it flew off the shelves after that.

This clever makeup buy is the perfect hint-of-colour lip gloss, leaving you with just a sheer wash of colour, while also smoothing and plumping your pout – in other words, a staple for your makeup bag, really.

With the grey, wet winters in the UK, who can blame the royals for wanting to face a sun-kissed glow here and there?

Princess Beatrice once revealed in an interview that she is a bit slow getting ready in the mornings and often end up having to apply her makeup in the car or on route to somewhere.

Her go-to products? Charlotte Tilbury mascara and a Bobbi Brown bronzer. The reason, she revealed, is that these two products are ideal for an easy, fool-proof application, even when on the move.