The pregnant singer, who is expecting her first child with footballer fiancé Wayne Bridge, uploaded pictures of baby clothes for a little 'dude' on Instagram.
She captioned the snap: "Having so much fun getting my little Dudes clothes together! A little boy to add to the @thesaturdays crew! Can't wait to meet the cheeky monkey!"
Frankie's bandmate Rochelle Humes recently gave birth to a baby girl called Alaia-Mai with JLS husband Marvin Humes, while Una Healy is also mum to one-year-old Aoife Belle with rugby player husband Ben Foden.
Frankie revealed she was pregnant on Twitter in May, writing: "Some big news from me today! Wayne and I are having a baby. We are both SO happy and can't wait for his or hers arrival!"
She has since faced Kim Kardashian-style criticism from internet trolls about her pregnancy body.
Hitting back at them, she told Heat magazine: "Celebrities are still people - if you're going to get bigger, then you're going to go that way. I think it's nice for people to see that not every celebrity is stick thin when they are pregnant."
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