The chart-topping singer was on the main stage at Seaclose Park on Saturday, 10 June, where she treated the crowd to a set that included her smash hit debut solo track 'Right Here'.
She looked every inch the popstar in her eclectic mix of black t-shirt, sparkling green flares, silver choker and sunglasses, and sported a striking hairdo after gelling her baby hairs down on her forehead.
Despite a pretty drizzly day, Jess' set was packed full of energy, as she powered through her back catalogue, eliciting huge cheers from the packed crowd.
The North London-born singer later said: "Thank you so much Isle Of Wight... Yesterday was very overwhelming and so special. I love all of you who stood and watched! We scared the rain off nothing but love."
Jess, 26, appeared at Isle of Wight Festival just before announcing her debut UK and Ireland arena tour, which kicks off mid-November and ends 1 December.
Jess' tour will start in Birmingham on 18 November, taking in Liverpool, Dublin, Leeds, Newcastle, Brighton, Plymouth, Cardiff and London.
Tickets go on sale 9am on Friday.