Rachel Breckle is currently pregnant with Jai Sharma's child, but the businessman's wife Charity and the rest of the village have no idea of the pair's connection.
Oaten, pondering Rachel's future mothering skills, told PA: "I think she's going to be fiercely protective and loyal of him or her, especially with how things may or may not develop.
"I'm sure Charity's going to find out some day, but I don't know where or when - and I'm preparing myself for when it happens because I think she's going to rip Rachel apart!"
She added: "But I think she's going to defend her child to the end of the Earth, really. And I think because she had such a difficult upbringing herself, she's going to be even more protective of the little one when it comes along.
"But I'm just dead excited to find out whether I'm having a boy or a girl!"
Rachel and Jai had their one-night stand in the summer, and viewers can expect trickier times ahead for them in the coming weeks as it becomes more difficult to keep their secret under wraps.