The Made in Chelsea star and style blogger posted pictures of herself and her husband Professor Green enjoying their Italian getaway.
Millie, who has changed her surname on Twitter to that of her rapper husband Stephen Manderson, showed off an array of swimwear and her enviable bikini body.
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"Love a leopard one piece," wrote Millie next to a photo of herself wearing a halterneck leopard print swimsuit.
"Cheers," said another which showed Millie relaxing on a sun lounger, holding a glass of wine aloft.
The couple, who are believed to be staying on the island of Anacapri near Naples, cuddled up in the sunshine for one photo which was captioned "Winding dirt roads".
Another picture, simply "Bride", shows the clear and pink diamond encrusted wedding band Millie has chosen to accompany her double banded engagement ring.
Millie and Professor Green married in a romantic ceremony at Babington House, Bath, on 10 September, where they were joined by around 120 guests including pop star Lily Allen and Made in Chelsea stars Caggie Dunlop and Rosie Fortescue.
The 24-year-old bride wore a vintage Alice Temperley lace wedding dress and towering Christian Louboutin peep-toe heels as she arrived at the ceremony on the arm of proud father Nigel.
The bride carried a simple bouquet of white, cream and pink flowers and wore her hair in an elegant plaited updo.