The 'It's My Party' singer joined the likes of JLS and The Saturdays on Saturday (31 August) and headed to Fusion Festival, where she performed a great set during the evening in a black and white printed ensemble.
Showing off her slim figure - which she has been working hard at recently with intense workout sessions - Jessie donned a tiny cropped top and some sexy high waisted leggings. She completed her look with a pair of trainers and some red lipstick.
Earlier in the day, Jessie proved how versatile her outfit can be by layering a red jumper and an oversized black hoodie over her cropped top while she greeted fans. Clearly she is a pro at packing light for her road trips!
On Sunday (1 September), Jessie got her tomboy wardrobe out and sported a cool, street wear style before taking the stage at Norfolk's Sundown.
She wore a leather snapback cap with a graphic print white T-shirt and a camouflage jacket, which was perfect for the unpredictable British weather.
The songstress also added a pair of black skinnies and some knee-high black boots to her outfit and posed for more pictures with her fans, as well as fellow singer A*M*E.
Later on in the evening, Jessie changed into a girly costume for her headline performance, sporting a pretty green and black two-piece that drew attention to her slim stomach again. She definitely knows how to make the most of her figure!
Her Sundown set went down a storm and even turned out to be one of Jessie's favourite shows of 2013.
Earlier today, she captioned one of the pictures from the evening: "Last night is in my top 3 fav shows of this year! Amazing crowd! Even in the cold you were so up for it! #sundown"
With festival season drawing to a close, we think Jessie has demonstrated that she has one of the best suited wardrobes. We'll be taking tips for next year!
Which one of Jessie's festival outfits do you like the most? Let us know as the best comment each week wins £50!