The actress took to Twitter to reveal her sister is pregnant and due to give birth in just two months' time.
Lucy also shared a scan picture of the unborn baby, and added the caption:
"My sister is having a baby in August... this is him swimming around in her belly x hello baby x (sic)"
And the 23-year-old actress could have more free time to play with the youngster soon as she is to depart the ITV soap next year.
However, the star could well be busy after recently admitting she is departing Weatherfield to turn her hand to other projects, and expects to return to the cobbles at some point.
She said: "I will be sad, but I'm excited to see what's going to happen in the future, although I have no idea what's going to happen.
"When I leave I'll have been there for five years, and I've never done anything else.
"But I'll end up going back - I'll be back."
My sister is having a baby in August... this is him swimming around in her belly x hello baby x (sic)
While it's not yet known how Bethany will leave Weatherfield, Lucy is hoping her alter-ego isn't killed off, and she would love her character to head back to Italy, where she spent half of her life with mum Sarah Platt (Tina O'Brien).
She said in an interview with Radio Times: "If it was up to me she would leave in a really nice way, just going to Italy or something.
"Smiling and happy, no bad things happening. But we'll see..."
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