25-year-old Frankie will battle it out with celebrities including Mark Wright, Alison Hammond and fellow pop star Pixie Lott.
But Mollie, 27, dismissed rumours of a feud between the two singers. She told the Daily Star: "They grew up together, they're friends."
While she denied any hostility, Mollie don't hide who she would be supporting, adding: "Oh come on, obviously Frankie.
"She's so ready, that girl was born to be on Strictly."
And Mollie isn't the only person who thinks Frankie has a great chance of taking home the glitter ball this year.
Former Strictly champion and judge Alesha Dixon thinks it's going to be very tight between Frankie and Pixie this year.
When asked who her favourite to win was, 35-year-old Alesha replied: "I have to say Frankie. My money is on Frankie and Pixie for the final. A lady is going to win this year."
Speaking to a British magazine about her fears for being on the show, Frankie said: "Falling over! I've that quite a lot on live TV shows and I normally get away with it.
"Normally people look at everyone else but when I fall here everyone will be like 'she's fallen down' and there's no way of really covering it up."