The pop star and her soccer player fiancé Wayne Bridge have announced they are expecting their first child together and the pair are completely overjoyed with the news.
Writing on her Twitter page, Frankie said: "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! (sic)"
Frankie was inundated with messages of congratulations on the social networking site and one person who was particularly happy she`d finally shared her pregnancy news was her sister Victoria Sandford.
Victoria tweeted: "Finally I can tell everyone IM GONNA BE AN AUNTY!!!!! (sic)
Frankie and Wayne got engaged in April and the romantic sportsman dressed up his lover`s pet dogs as a bride and groom for when he popped the question.
Frankie recently revealed: "Wayne took me to a hotel and he got my dogs involved. I didn`t know my dogs were there and they came in in little bride and groom outfits. And Pixie had the ring around her neck on a ribbon."
Frankie is the latest member of The Saturdays to get pregnant.
Una Healy and her husband Ben Foden welcomed their daughter Aoife into the world in March 2012, while Rochelle Humes and her husband Marvin Humes are due to have their first baby in the coming weeks.
The trio are joined in the band by Vanessa White and Mollie King.