The Coronation Street star uploaded the picture which appears to show the photogenic couple snuggled up together in bed. As Michelle, 26, stares at the camera, Mark can been seen giving her a tender kiss on the lips.
Michelle also shared the snap on her Twitter page - and it has already been liked by more than 27,000 people, with fans quick to tell her what a great couple they are.
"Cutest photo ever," wrote one follower, while another added, "Perfect couple".
The picture comes just a couple of days after Mark took to Twitter to express his love for his girlfriend of eight months. "Twitter is for expressing your feelings (especially after a drink) it feels so good to be so happy," the 26-year-old wrote. "I love my girl more than anything #honest."
The smitten star has been dating Michelle since the start of the year, after meeting up at a party in Dubai.
"We are really happy," Michelle said in June. "I'd met Mark before, but a group of us met up, and it was an amazing night. We went to a festival on the beach and to a club and stayed up all night. Was it a night that changed my life? Perhaps."
Since then, she has proven a hit with Mark's family, including his sister Jess. "I absolutely love her," the TOWIE star told the Daily Star in August. "She fits in with the family really well. She's very down to earth. What you see is what you get."
Mark, recently crowned best groomed male celebrity, has been busy recently filming his brand new ITV2 show, Wright Off The Beaten Track, in which he travels around the world helping different communities throw parties.
Announcing the show back in July, Mark said. "I know the Essex party scene inside out, but I've no idea what to expect about the people I'll be meeting or the parties I'll be throwing.
Not since leaving the (I’m A Celebrity…) jungle have I been put in a situation that feels completely out of my comfort zone, but I'm determined to take on whatever challenge comes my way."
Manchester-born Michelle, meanwhile, has been hard at work on the set of Coronation Street.
The actress, who has appeared on screen as feisty Tina McIntyre since 2008 and has been voted 'Sexiest Soap Female' four times at the British Soap Awards, has confirmed she will leave the soap next year to pursue other acting projects.
She also recently revealed to HELLO! that she is planning to move down south and set up a home with Mark.
"Yep, we plan to start house hunting after Christmas. We'll have been together for over a year by then and we'll look at areas around Essex, so it's easy to travel to London," the 26-year-old told HELLO!. "I am really excited about it."
She also set the record straight about rumours her decision to quit the soap had anything to do with wanting to spend more time with Mark.
"I didn't decide to leave because of Mark. It's just how things have worked out. I'd actually been thinking about leaving on and off for a couple of years. It was a huge decision to take and a very scary one, as you never know what you'll do afterwards.
I will miss it but after six years, I know it's the right thing to do. If I don't do it now at my age, when I have no children or ties, then when will I? I don’t want to look back in ten years time and think what if...?”