The actress's character Roxy Slater will be seen giving birth prematurely next week following an argument with her partner Sean (Rob Kazinsky).
Simons, 31, already has two-year-old twin daughters, Jaimee and Maiya, with her husband Theo.
Discussing the real-life impact of Roxy becoming a mother, Simons told We Love Telly! magazine: "Me and Rob bicker over who gets to hold her. I've been getting broody. My husband says no more, but I will get my wicked way!"
The star recently admitted that she was "a naughty girl" before she met Theo.
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