Now her facialist, Deborah Mitchell has explained the reason why the Duchess keeps coming back for more.
The founder of Heaven Skincare says that her bee venom facials and masks use only the freshest of bee venom, whereas other copycat versions use the freeze-dried stuff.
"The Bee Venom Mask was my invention," she explained to The Telegraph. "I have the patent."
The venom has been hailed as nature's botox, probably why Mitchell counts Victoria Beckham and Kylie Minogue among her fans.
But with a small pot of the Bee Venom Mask costing £73, (heavenskincare.com) desperate people are trying to get their paws on it by other means.
"People buy products that look like Heaven on eBay, looking for a bargain," Mitchell says. "But these may contain parabens and preservatives. Some even cause rashes. My products never cause rashes. It's very difficult."
Wait, one more question - how on earth do you extract bee venom?
According to Bio Bees, a metal plate is put into a bee hive which has a light electrical current running through it, which isn't strong enough to hurt the bees.
When the little fellas walk on it, they try and sting the plate, but because it's hard, they merely drop their venom, but keep their stinger - so no bee fatalities. The venom is then scraped off.
Learn a new thing every day. But can it beat these weird celeb beauty rituals...
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