Whether you like the Duchess of Cambridge's style or not, Kate knows what suits her - and although she's not exactly experimental when it comes to hair and cosmetics, this discerning approach applies to her beauty regime too.
However, perfectly blow-dried tresses and radiant complexion aside, do her skincare secrets actually work?
New York Times writer Maggie Lange put Duchess Kate's favourite products to the test with the hope of acquiring "the glimmer of royalty."
Lange sampled a series of products by Swiss skincare brand Karin Herzog (it's said to be one of Kate's favourites) over three weeks. These included the Oxygen Face Cream, Oxygen Hyalu Lift Night Cream, the Vita-A-Kombi 1 Cream and a cleanser.
The results? "I had broken out mildly and my eyebrows were bleached to a tawny blonde," Lange writes.
"Only after seeing bleached brows did I read the teensy fine print on the lotions: 'Do not apply to eyelashes or eyebrows as it has a slight bleaching effect on hair.' Oooh. My application of the lotion had been a smear-across-whole-face-by-the-palmful method."
As well as the eyebrow disaster, Lange also noticed "two serious, angry pimples" emerge and after six weeks, she gave up on the routine completely.
Her conclusion? "The average commoner just cracks under the layers of all that rich, gilded pressure."
Perhaps the Kate-effect doesn't translate so well when it comes to beauty products.