But last night it was the impressionist talents of Francine Lewis who brought the judges to their feet on the reality talent contest.
Francine Lewis took to the stage and immediately burst into the voice of Stacey Solomon, before channelling Katie Price and then Cheryl Cole, much to the delight of the Geordie singer's "frenemy", as Francine called him.
WATCH Francine in action above.
Simon Cowell commented: "That was incredible, brilliant choices of people."
And David Walliams added: "Amazing to be funny and beautiful, I thought it was just me."