The daytime show's official Twitter account shared a cute picture of a beaming Michelle and rather awestruck Mark on Thursday (26 June).
They'd drawn a speech bubble next to Mark's head with the words: "What is she doing here?!"
We doubt Mark said that, though! Probably more like, 'Brilliant! A surprise visit to set by the fiancée! Isn't she beautiful? I'm so lucky!"
The ridiculously gorgeous couple were pictured on This Morning's set as Mark prepared to host from The Hub.
A very proud Michelle snapped a picture of her man rehearsing, adding the caption: "He's getting ready! Tune into ITV's This Morning [to see] Mark Wright presenting on The Hub."
Michelle looked beautiful in her white strap top and pleated skirt - and proved she's a girl after our own hearts by having a slight make-up malfunction earlier in the day.
Mich tweeted: "Note to self... DONT wear white clothing before putting on make-up!!! ... ...EVERY bloody TIME!!!!!!"
Yep, we hear ya!
Earlier this week, the former Coronation Street star revealed that she and Mark have set a wedding date, although it hasn't been made public.
They became engaged in Dubai last year and have said they'll marry in the UK sometime next year, most likely around the summer. But despite being a high-profile couple, they are hoping to keep their big day private, with Mark telling Reveal it will be a "Mark and Michelle day" away from the spotlight.
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Mark and Michelle's romance in pictures:
Copyright: WENN Ratello