They're worth millions and can afford to buy anything they fancy, but when it comes to body care both Kim Kardashian West and sister Khloe head straight to the supermarket for this budget buy.
The sisters swear by it, saying it kept their skin in beautiful condition throughout their pregnancies and ensured they did not develop stretch marks either. The product is, of course, Bio-Oil - an honest-to-goodness bargain at just $15 for a 60ml bottle.
The reality TV stars are not the only high-profile women who are said to be fans of this rich, natural oil.
Word is the Duchess of Cambridge Kate Middleton and the Duchess of Sussex Meghan Markle also keep their skin super soft and lovely by applying Bio-Oil all over twice daily
Kim loves the oil so much she posted about it on social media sending her many millions of fans into a frenzy.
"It just makes my skin glow, and it has so many benefits," she wrote.
"If you have scars or stretch marks, you just massage the oil onto the area two times a day." Kim even called the formula a 'lifesaver' adding that when pregnant she 'would apply it like crazy'.
Kim's sister Khloe, mama to True, one, doesn't need to pinch Kim's oil bottle. She keeps one with her at all times.
She also keeps a bottle in the bathroom.
"I keep Bio-Oil in my shower and before I get out, I drench myself in it from head to toe," she says.
Duchess Kate Middleton, who gave birth to her third child baby Louis in May 2018, is known to have relied on the inexpensive oil to keep her figure stretch mark free.
Duchess Meghan Markle, pregnant with her first baby which is thought to be due in April, is also a fan. Possibly Duchess Kate put her onto it? But then Meghan, a former Hollywood actress, may have stumbled across this cult classic when still appearing on the small screen in the hit series Suits.
She wouldn't be the only A-Lister obsessed with the bargain buy. It is also a favourite of Natalie Portman and even Victoria Beckham.
The oil is famed for its formulation which is a combination of plant extracts and vitamins suspended in an oil base. It contains the breakthrough ingredient PurCellin Oil™. This clever oil changes the formulation’s overall consistency, making it light and non-greasy, ensuring that the goodness contained in the vitamins and plant extracts is easily absorbed.
That means it feels amazing, plus it absorbs quickly so you don't have to worry about your designer clothes or luxurious linen sheets.