"You might be surprised to know that this is the only occasion throughout the year when Her Majesty does not do her own makeup," she wrote in her new book, The Other Side of the Coin: the Queen, the Dresser and the Wardrobe.
She explains that the monarch's distinctive beauty look consist of fuchsia pink lipstick, a light pink blusher and a soft eyeliner.
The Queen's biographer, Sally Bedell Smith, has also previously revealed her majesty prefers Clarins and Elizabeth Arden beauty products.
The Queen also isn't the only member of the royal family who is happy to do their own hair and makeup.
Kate Middleton, reportedly did her own makeup for her wedding to Prince William, and Meghan Markle apparently does her own makeup for royal engagements.
Her wedding makeup artist Daniel Martin previously told People magazine: "She's been doing her makeup herself. She's not fussy - she's just trying to get it on and get out the door."