The mum-to-be was chic in black trousers, a white blazer and sky high black heels during her chat with Eamonn Holmes and Ruth Langsford, but swapped into a comfier ensemble of loose fitted T-shirt, leather jacket and ankle boots as she left the ITV studios.
Frankie and band mates Mollie King, Rochelle Humes, Una Healy and Vanessa White have been doing the publicity rounds for their new single 'Gentleman' and at the same time welcoming Rochelle back to the band!
Rochelle returned to Saturdays duty last week following maternity leave, and today's performance of 'Gentleman' marked her live comeback.
The star, who welcomed daughter Alaia-Mai on 20 May, couldn't help gushing about her new arrival during the show. No doubt Rochelle will be passing on any useful pregnancy tips to Frankie.
Frankie became engaged to footballer Wayne Bridge in April and the couple announced their happy baby news a few weeks later.
Discussing her engagement on This Morning, she said: "Unless you like dogs it sounds so lame! We had a nice quiet dinner then he went off to the toilet. When he came back the dogs walked in with him wearing bride and groom outfits and he got down on one knee... It was like a scene out of The Only Way Is Essex. I went, 'Oh, shut up!'"
Frankie, who has just returned from a holiday to the sunshine-soaked south of France, later joined her band mates to perform 'Gentleman' - but admitted beforehand she was feeling nervous after watching their choreographer perform her part during a rehearsal.
She tweeted: "Shouldn't of let @AaronRenfree stand in for me at the camera rehearsal. He did a sexier job?! Might get him to do the real thing!"
Luckily for Saturdays fans, she didn't, and FYI Frankie, we think you looked great.