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The actress, who has been on the cobbles for six years, admitted that she wants to see Michelle push the boundaries in an upcoming storyline.
Marsh told OK Extra: "I'd like her to have a toyboy! That would be really funny, as she's quite moral. I'd like to see her doing something a little bit daring and risqué.
"Little Harry Styles could play the toyboy - he's so cute! My daughter's got a big crush on him."
Michelle's most recent story saw her among the suspects in the Frank Foster murder case. However, the businessman's mother Anne (Gwen Taylor) was later unmasked as the real culprit.
Reflecting on the plot, Marsh continued: "It's been brilliant, but really tiring and intense. It's great to get your teeth into a storyline like that, and I was so proud to be part of it.
"We knew Anne did it and we had to keep it a secret, so I was pleased it didn't get out. It's such a shame when the papers print spoilers and it ruins it for everyone."
Coronation Street airs Mondays, Thursdays and Fridays on ITV1.
> Coronation Street musical casts Kym Marsh as Elsie Tanner
> Read more Coronation Street news and spoilers
