The singer, 25, showed off her totally toned and gorgeous bod on stage at East Coast Live - and we think she could give Chezza a run for her money any day!
The Saturdays performed their latest hits at the music festival at Chantry Park, Ipswich on Saturday (28 June) in front of thousands of fans.
And while ALL five ladies looked stunning (as always!), we couldn't help notice that Frankie looked smokin' hot just eight months after giving birth to her first child.
Frankie, who is engaged to footballer Wayne Bridge, showed off her toned midriff in a cropped black mesh top, which she teamed with a cute mini skirt and orange belt.
And it's clear to see her hours of working out have clearly paid off!
Mollie King, Una Healy, Vanessa White and Rochelle Humes also looked good enough to eat as they performed hits including 'What Are You Waiting For?'.
The single has been taken from their forthcoming album Finest Selection: The Greatest Hits and will be released on 10 August.
As usual, the girls rocked coordinated outfits in black, white and orange - we love!
Earlier this week, Frankie tweeted: "Just watched Cheryl. Nicole Scherzinger. JLo and Ariana Grande. If you need me. I'll be in the gym..... #thosebodies."
The star gave birth to her first child, Parker Bridge, in October 2013 and has gradually lost her baby weight with sensible eating and exercise.
You're looking pretty good to us, Frankie!
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Listen to The Saturdays' Greatest Hits Megamix: