Joining her Saturdays bandmates list Mollie King, 25, Una Healy, 31 and Vanessa White, 23 on Wednesday night The Hangover 3 UK premiere, the 24 year-old wore a long grey and white snakeskin pattered dress with a slit to the thigh.
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Pregnancy seems to be suiting the star, who couldn’t stop grinning on the red carpet.
Frankie, who is still performing with The Saturdays, is already preparing for the arrival of her little one and has been shopping for baby clothes. She shared a picture of a teeny pair of plimsoles with the caption: 'So tempted! Need these little ones in my life!! Too cute'
Frankie and her fellow Sats appeared at the premiere minus bandmate Rochelle Humes, who gave birth to baby Alaia-Mai earlier this week.
And it seems that the arrival of Rochelle and husband Marvin’s little one has got Frankie even more excited for the arrival of her first child with fiancé Wayne Bridge.
She took to Twitter after visiting Rochelle and her brood this week, gushing: ‘Oh my goodness absolute baby bliss! Alaia-mai is gorgeous! Seeing them all together was so lovely. New little family. Come on baby Bridge!’
'You might have to go through the little horrible bit but at the end you get something lovely'
And speaking at the premiere on Wednesday, she said: 'I think just seeing the baby was lovely and it just makes you think , 'Okay you might have to go through the little horrible bit but at the end you get something lovely."'
But Frankie, who got engaged to her footballing lover Wayne in April, revealed that she was worried her fiancé might get up to similar antics as the Hangover boys on his stag do!
She said: 'I do watch The Hangover and I think it could be very close to whatever Wayne does. Sometimes I'm not sure if I want to watch it or not but I love it.'