The pint-sized popstar wears a floral dress in the snap, as she leans on Will.i.am's shoulder alongside Sir Tom Jones and fellow judging newbie Kaiser Chief frontman Ricky Wilson.
The 'Spinning Around' singer has replaced Jessie J on the BBC One singing contest, while Ricky has taken up Danny O'Donoghue's empty red chair.
Jessie offered some advice to her successor, telling Metro: "What I would say to her is be the first to put out a story on your Instagram before anything is written. Control your stories.
"Just be yourself. That’s it. You are going to get the flak whatever you do and say. Just enjoy it."