But, for the first episode of her new show The Voice last weekend, the pop star was spotted flaunting long, purple dip-dyed lengths prompting us to investigate how many hair looks has Jessie J actually had.
The answer: More than we can count... wed estimate at well over a hundred in two years
Her bob hairstyle may be most recognisable as her own because its the style she always goes back to. And its apparently so recognisable that Coco Cola are putting mini plastic versions of her bob on bottles of Vitamin Water to coincide with the Olympics. But, taking a trip down memory lane reveals that Jessie J has, in fact, embraced more hairstyles in just under two years than most of us do in a life time.
Jessie J burst on to our musical radar in 2010 with hit single Do it Like a Dude and her trademark black, glossy bob complete with blunt fringe, but since then shes worn it with a centre and side part as well as big and curly at the 2011 MTV EMA Awards. She also introduced colour red, purple and blue.
Just as the singer embraces colour, she isnt afraid of length either. Shes been spotted with raven extensions, as well as wefts in rainbow hues we loved the multi-coloured ponytail she flaunted on stage last November. While her look often has edge, she stunned fans and critics when she wore her hair with a glamorous old-school wave at an award ceremony last June.
And just yesterday she tweeted a picture of her new blonde dip-dye look saying Look I'm Blonde :D wooooooo. Her constantly changing hairstyles often created with hairstylist Lyndell Mansfield - means Team ELLEuk are officially on Jessie J Hair Watch and waiting to see if she changes her hair for the next episode of The Voice tomorrow.
What hairstyle would you like to see Jessie embrace, plus which is your favourite look from the gallery above (we warn you, theres a lot to choose from!)
The Voice in on BBC 1 Saturdays, 7pm.
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Jessie tweets a picture of her new blonde hairstyle
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Jessie J and her fail-safe blunt bob back in 2010
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Jessie experiments with grey hair extensions, summer 2010
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Gone with the fringe and in its place a centre parting
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May 2011 and Jessie tries out a longer, sleeker look
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It's still May 2011 but Jessie steps out with her trademark bob again
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Here Jessie embraces a more glamorous look, June 2011
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August 2011 and Jessie is back to the bob, but this time it's purple and black
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Still August, but here Jessie's gone all-out with a bold purple bob
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Still August! Jessie gives blue hair extensions a whirl
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Back to a purple and black bob, but this time the purple is placed at the front.
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Jessie gives a sleek ponytail a try.
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September 2011 and Jessie's hair is all one colour, long and super glossy
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Jessie J embraces a curly texture and sweeps it over to one side
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Short and curly with no fringe in sight
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Jessie piles her curls on her head for a dramatic up-do
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November 2011 - Jessie opts for a bold, blue bob
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November still, but this time Jessie steps out with a red bob