The couple were on holiday in Dubai when Mark asked Michelle to marry him, but Michelle had to get the sparkler resized before she could wear it.
Last week she tweeted her frustration, writing: ‘Cant wait 2get my ring back nxt week after its been adjusted, so many people askin 2 see it, n I have 2 show them a bare hand’
But the actress finally showed off her giant rock at her Corrie co-star Catherine Tyldesley’s birthday 30th party in Manchester at the weekend, teaming the diamond with a pink playsuit and a tan.
It has been reported that former TOWIE star Mark spent £20,000 on the ring, which features a square-shaped five-carat sapphire surrounded by diamonds.
Michelle is said to be quitting Manchester when she leaves her role on the soap next year to move in with Mark in Essex.
She was previously engaged to The Wanted’s Max George until she called off their engagement in July 2012.
During a recent appearance on Lorraine Kelly’s ITV show, the singer wished his ex and her new fiancé ‘all the luck in the world.’
Mark was engaged to his childhood sweetheart and TOWIE co-star Lauren Goodger, who has also wished the couple her best wishes.
She told a UK magazine: ‘I wish them all the best and I'm very happy for him. That's it, there's nothing else for me to say, really.’