The former Made in Chelsea star tweeted a selfie in the bathroom mirror with the caption: 'Red wine hangover #sorehead #xmashangover.'
Her true hangover face may have been cleverly disguised by the camera flash but some of her favourite hair and skin buys were in full view!
Beauty hawks will have spotted a bottle from bath and body brand, Cowshed. We've got a sneaky feeling it could be one of their best-selling Bath and Shower Gels, £16 each. Our pick for a morning-after pick-me-up? The energising Grumpy Cow version with mandarin and grapefruit essential oils.
We also spied what looks like a Diptyque mini candle, £20.
She may be a fan of luxe tub treats but we spotted some serious bargains perched on the edge of Millie's bath. The two blue bottles with gold lids look distinctly like a shampoo and conditioner from affordable haircare range, Organix.
Their Moroccan Argan Oil Shampoo and Conditioner are saviours on dry, damaged hair and will set you back just £6.99 each!
We've cracked Millie's hair and body secrets, now all we want to know is... how can we get that stomach?!
What do you think of Millie's latest selfie? Tell us below as the best comment from across the site each week wins £50!