In fact, if last night's Twitter action is anything to go by (thanks @XFactorStyle!), she might be a last minute mistress.
Still working dressing gown glamour half way through the live show last night - yes, Xtra Factor does kick off the moment Dermot O'Leary says goodnight - Caroline made an impressively quick costume change to join Olly Murs on stage.
Slipping into a Zara ensemble, Caroline wowed in a loose shirt and quilted leather mini skirt, finishing off with smoky eyes plus matching red nails and lippy.
What do you think? Loving the look? Impressed with her speedy style?