The band went on permanent hiatus in 2014 and Mollie released her debut single, Back To You, in 2016 with plans for her own album underway.
The 30-year-old began her rise to fame by auditioning for The X Factor in 2005 aged 18, where she clashed with Sharon Osbourne over her chosen outfit despite impressing with her vocal.
She returned in 2007 as part of girl band Fallen Angelz, but they did not progress past the Bootcamp round.
Then in that same year Mollie auditioned to be part of girl band The Saturdays, alongside the likes of Frankie Sandford, who had been a member of S Club Juniors.
As soon as they'd formed the group toured with Girls Aloud, and they eventually released four albums, selling five million of them.
AJ, aka Alex Joseph Pritchard, is a 23-year-old professional dancer and Strictly partner from Stoke-on-Trent.