The 27-year-old said that she and her presenter fiancé argued over where to sit their guests.
Appearing on ITV's Loose Women, Michelle said: "We are doing the table plan at the minute. I had to go to bed last night, I thought, 'Right, I can't take it, I've got to go to bed'.
"I'm the most disorganised person you'll ever meet, where Mark is the opposite, so it's balancing quite well.
"I am thinking, 'Thank God he's getting involved as I need help'. It's working really well. There haven't been any arguments yet, well apart from the table plan today."
Michelle confessed that 200 people will celebrate with them when they tie the knot later this month, so no wonder finding them all somewhere to sit is proving stressful!
The former Coronation Street actress also discussed her recent hen party in Dubai and said she had a blast.
"There were thirty girls that went. It was great. The Essex girls and the Manchester girls came together so it was brilliant."