Former X Factor finalist Rebecca posted the photo on Instagram today (21 November) and it shows the tot dressed in a pretty pink velvet and chiffon dress.
Commenting on her snap, Rebecca told her followers: "She is just adorable my little dolly girl xxxxxxxx."
Indeed she is, Rebecca!
Liverpudlian Rebecca gave birth to Arabella last month and was besotted from the moment she set eyes on her new daughter.
The star, who finished in second place on the 2010 series of The X Factor, tweeted: "I don't want to sleep I just want to look at her ... thank you for all the love and support."
Rebecca is already mum to Lillie Mae, nine, and seven-year-old Karl, who she had with a previous partner. She split with Arabella's father after falling pregnant with her, but has since said she is grateful to him for giving her a "gift from God".
Celebrities who have welcomed babies in 2014:
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