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.
Perhaps the clearest sign they're an item came at the Pride Of Britain awards when they were seen leaving the party together after posing for pictures looking incredibly close.
Days later AJ teased viewers of spin-off show It Takes Two by revealing Mollie "falls in love with [him]" during their latest dance.
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