The 39-year-old star revealed in the most-recent issue of her GOOP newsletter that she just can't get it right.
She said: 'Believe it or not, I am terrible at doing my own makeup. I'm decent at doing it for a friend, but when it comes to my own face, I never get it right.
'I have been wanting a step by step lesson for ages so I asked my London makeup artist, Emma Lovell, to show me how.
'One of my gorgeous school mum friends from my son Mosey's class agreed to be the model (thank you, Kate!), and I learned so much. I hope it's helpful for some of you!'