Onlooker wouldn't have been able to guess that The Saturdays star only had her baby son Parker less than five months ago - there wasn't a hint of baby sick anywhere to be seen!
The singer, 25, looked beautiful in an understated black fitted dress with halter neck straps, which she teamed with peep-toe sandals and a fuchsia pink clutch.
Arriving at London's late night lounge bar Chakana with friends, Frankie wore her trademark short hair over one eye with just a hint of pink lipstick.
She also looked tanned and toned thanks to her post-baby keep fit regime.
Since giving birth to baby Parker in October last year, Frankie has been keen to get her body back in shape and has been working out with her baby son beside her!
Parker is her first child with fiancé Wayne Bridge, a Reading FC player.
The Saturdays release their new single 'Not Giving Up' on 7 April, the fifth song to be released from the girls' studio album, Living For The Weekend.
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Watch the video for The Saturdays' single 'Not Giving Up':