Xtra Factor host Caroline Flack pulled off her best pout as she posed alongside the life-size music mogul and X Factor boss, while backstage at the auditions in Manchester.
Posting the funny snap to Twitter, she said: "The big boss is here today."
The judges - Gary Barlow, Nicole Scherzinger, Sharon Osbourne and Louis Walsh - are still searching for Britain's next big star after kicking off the auditions process in Glasgow last week.
Despite just finishing Britain's Got Talent, the real Simon is actually over in the states filming the American equivalent, US X Factor, alongside Demi Lovato, Kelly Rowland and Paulina Rubio.
We can expect Simon to return to the UK talent show soon though, as back in April he vowed to make his return as a judge, after last being on the panel in 2011.