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The actress, who plays Roxy Slater, recently filmed scenes in which her character's baby is born premature and must fight for its life.
Simons admitted that the plot brought back bad memories as she had feared that her own twin daughters would be born early.
"It was pretty difficult. It's always hard to see little premature babies and it was heartbreaking," she told DS.
"I have got twins myself and because twins are always expected early I had exactly the same tour around hospital wards. It was really hard for me. We're just starting to film the Christmas build-up now and it's really emotional."
Simons won the 'Best Newcomer' award at this week's Inside Soap Awards.
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