The Saturdays star excitedly shared a snap of her view of the stage at Taylor's gig, before referencing one of Ms Swift's lyrics.
Frankie, 25, said: "A bit of Swifty tonight! Not gonna lie I'm feeling 22oooooo!!!"
We are loving your bright green top, Frankie!
The singer has also found herself in a bit of a dilemma recently.
Like most brides-to-be, she's been thinking about her wedding day hair and tweeted over the weekend about her predicament.
She said: "Really want to change my hair but also scared to change it before the wedding...hmmmm girl problems..."
Frankie went back to her trademark crop after a spell with long, brunette hair while she was pregnant with her baby son Parker.
Now gearing up to her wedding to footballer Wayne Bridge, she's clearly considering another change of look.
And it seems fellow The Saturdays star Una Healy is keen for her to do it.
Talking about the blonde style Frankie rocked in 2010, Una replied: "Go back to Higher blonde!! I loved that on you x"
Watch this space!
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