Michelle’s character Tina McIntyre is set to be killed off in the New Year, after the actress announced her decision to leave the hit soap.
"I'm pretty sure it's going to be a very dramatic storyline," Mark, 26, told Digital Spy as he attended The Sun Military Awards. "She's spoken about it all the time, so (I'm sure) it's going to be watched by millions.
"I think it’s a great way for her to go out. She's going out with a bang, and that's the way to do it, instead of going off quietly.
"I think everything she does on that show is incredible. Every time I watch it, I smile. I'm so proud of her."
Mark, who proposed to Michelle in September, added, "I was never a big Corrie fan… but of course I watch (now). I keep up with her storylines, and her on-screen romances."
Michelle on the Coronation Street set
The former TOWIE star even said he doesn't mind Michelle’s romantic storylines. "There's no jealousy," he said. "I think when I first saw it I was a bit like, 'Woah', but then after that it was fine. It's her job."
Michelle, 26 herself recently spoke about the murder plot storyline, saying, "At first she (Tina) wasn't (going to be killed off), and then they came up with a really good storyline that involves a lot of characters on the street, and it's going to be a big storyline next year.
"So in a way, it's an honour and I'm very excited for it."