The former X Factor star is expecting her third child, a daughter already named Arabella, and shared a new photo of her blooming bump to Instagram last night (11 August).
"Overnight, my bump has grown and the penguin waddle is in full motion," she said.
"I can't even tie my shoes and I hate everyone today. Help me sweet Jesus, let me be nice Becky again. I don't like these hormones!"
Singer-songwriter Rebecca looked gorgeous in the selfie, wearing a fitted cream dress and oversized sunglasses. Very Hollywood!
And that's rather appropriate given as she's currently over in LA working on new music. She said two days ago: "I can't wait for you to hear my new album and be back on the road again."
Before jetting off to sunny California, Rebecca gave an interview to the Liverpool Echo where she admitted she doesn't love being pregnant as much as other women might.
"You know those women who love being pregnant and look fabulous all the way though? Well I'm not one of them," she said. "I love babies and I love children but I really struggle when I'm pregnant. I feel so sick and so uncomfortable. I just can't wait for her to be born."
The baby is due in November.
Rebecca - who hasn't publicly revealed who her baby's father is - is also mum to daughter Lillie May and son Karl.
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Listen to Rebecca's gorgeous song 'Nothing's Real But Love':