The 'Domino' singer was clearly keen to show off her svelte silhouette in her stunning jade jumpsuit, but the plunging neckline left very little to the imagination!
From the front, Jessie looked sexy, leggy and totally fabulous as she paraded her pins and décolletage in her long-sleeved vintage one-piece.
But from the side the starlet fell victim to a slight wardrobe malfunction as the gaping neckline revealed more than a hint of side boob. Oops!
We just hope she had some tit tape stashed away in her clutch...
Narrowly avoiding an embarrassing nip slip, the British songstress accessorised her daring ensemble with gold statement earrings, elongating her limbs with nude pointed courts by Jimmy Choo.
And we couldn't help but notice her new hairdo either.
Jessie has been switching up her barnet left, right and centre recently. Earlier this month she showed off an Elvis-style quiff, before clipping in long, tumbling extensions a week later.
She even unveiled striking aqua blue locks at one point!
But this time Jessie went back to her raven-haired roots, skipping the hair pieces and opting for a heavy lash-skimming fringe.
We wonder if her trademark Mystic Meg bob will return anytime soon...?
What do you think of Jessie's outfit? Let us know by commenting below as the best comment across the site each week wins £50!
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Watch Jessie's video for 'It's My Party' below: