The Little Mix singer, 22, showed off her striking red hair in a Twitter selfie today (19 April).
Alongside a picture of her newly-dyed locks cascading around her shoulders, Jesy directed a message to her hairdresser.
She wrote: "Thanku sooo much @shivvvey and @headmastersuk for my new ginger locks I feel like a new woman ;) xjesyx"
Since Little Mix won The X Factor in 2011, Jesy's hair colour has been every shade from blonde to purple and brunette - but this has to be our favourite so far.
And Jesy got the chance to show her fans her new look when Little Mix performed at a Rugby Union match between Wasps v Gloucester in Twickenham.
Along with bandmates Perrie Edwards, Leigh-Anne Pinnock and Jade Thirlwall, Jesy performed before the Premiership match.
Earlier this week, Little Mix unveiled the artwork for their new single 'Salute'.
The girl group are releasing the track as the third single from their album of the same name.
What do you think of Jesy Nelson's bold new hair colour? Tell us below!
Watch the video to Little Mix's official Sport Relief single 'Word Up':