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Her saucy scenes will be a welcome relief for viewers.
They have been left reeling in recent weeks by the doom-and-gloom storyline featuring killer Pat Phelan.
Catherine, 34 – who plays Eva Price but is leaving next year – says she will cause a stir when she appears at a nativity show in a very sexy outfit.
Coronation Street babe: Catherine Tyldesley
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“There’s nothing fluffy about it – it’s a bondage-y reindeer!”
Catherine Tyldesley
Her character – on the rebound after discovering fiancé Aidan Connor (Shayne Ward) cheated on her – has a festive frolic with Adam Barlow (Sam Robertson).
She giggled: “It’s so illegal! It’s a children’s nativity at a community centre, and I felt bad actually wearing that outfit in front of children! There’s nothing fluffy about it – it’s a bondage-y reindeer!
“But it’s very funny – that’s the comic relief at Christmas.
“It’s great with vicar Billy’s reaction because he’s like: ‘Oh my God, this is for the kids and this is very Ann Summers.’”