The Quality street heiress' pink diamond wedding band could clearly be seen in the snap, a photographic split between her nails and her hair.
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Whether an accident or not, the snap seemed to confirm there's no trouble in Millie's marriage to Professor Green, as recent reports have suggested.
The 24-year-old posted the photo the day after her husband – real name Stephen Paul Manderson – responded to claims "the magic had gone" from their four-month union.
"Excuse me because we choose not to live out our relationship in the public eye wherever possible and we don't show up to the opening of an envelope," he wrote. "Hence not giving you much to write about...
"Does it make you feel better about yourself printing such negative things about others even if they're absolute lies?"
The 30-year-old rapper went on to point out how the work he had done last week, including a documentary and interviews "to help those effected by suicide" had been ignored by the press.
He finished by discrediting the so called source who the alleged claims came from. "None of our friends would speak a word to bottom feeders," he insisted.
Stephen and Millie married in a romantic ceremony at Babington House, Bath, in September. They were joined by around 120 guests including pop star Lily Allen and Made in Chelsea stars Caggie Dunlop and Rosie Fortescue.
Millie wore a vintage Alice Temperley lace wedding dress and towering Christian Louboutin peep-toe heels and carried a simple bouquet of white, cream and pink flowers and wore her hair in an elegant plaited up'do.