The songstress was spotted with flowing black tresses at London Fashion Week on Sunday (16 February) and she even accessorised her new look with a patterned headscarf.
The headscarf complemented Jessie's cool orange jumpsuit, which she wore to watch the Vivienne Westwood show, and her outfit was given a finishing touch with a black handbag and a pair of orange heels.
Very boho chic!
But ever the hairstyle chameleon, Jessie didn't stick with her extensions for long and later in the evening, she reverted back to her short cut for a BAFTAs party.
The 25-year-old slicked back her cropped hair and teamed the sleek look with a sexy black gown, which featured a daring split up to the thigh and a plunging front.
She added a pair of strappy heels and a black clutch for that extra glam factor and partied the night away until her feet ached - after posing for a selfie with a rogue BAFTA award!
Uploading the fun snap on Instagram, Jessie wrote: "Found one of these bad boys on a table so I pretended it was mine and did this childish selfie! It was so heavy! Whoever it belonged to was so watching me probably thinking what a kn*b! Lol #baftas #afterparty I danced so much my feet are crying!"
The pop star is certainly keeping us on our toes when it comes to her hair, since she has been chopping and changing her tresses so frequently this year.
Last month, Jessie debuted a striking blue hairstyle while on a trip to Los Angeles when just days before she had been seen with shoulder length black locks.
We wonder what she'll try next!
Which hairstyle do you prefer on Jessie? Let us know, as the best comment from across the website each week wins £50!
Got an iPad or iPhone? Reveal Mag has been especially designed to fit!