The 'Wings' singer teamed her hot pants with a black T-shirt and a black mesh shirt, adding a slick of red lippy for glamour.
Jesy recently hit back at rumours about her weight, tweeting: "Hey peeps just so you know I'm a happy & healthy size 10... Not sure where the size 6 thing came from but no dramatic weight loss here! Just wanted to clear that up;) Much love."
The singer spent the weekend at Virgin Media's V Festival in Chelmsford, Essex, where she hung out with stars including One Direction's Niall, The Saturdays and Union J.
Union J's George Shelley was forced to deny rumours he was dating Jesy after pictures of them looking cosy in the Virgin Media Louder Lounge surfaced, insisting they are actually just friends.
Meanwhile, Little Mix celebrated their two-year anniversary over the weekend, too, marking 24 months since their formation on X Factor.
Jesy said: "Happy 2 year anniversary girlies woohoooo love u all sooo much my sisters and best friends for life."
Leigh-Anne Pinnock added: "Happy 2 years girls! You've changed my life forever and I love you all so much! Here's to Little mix lasting 4eva (Granny Mix)."
Jade Thirlwall wrote: "Dunno what I'd do without u girls, always wanted a sister n for 2 years I've had 3! So proud of us n love you no matter what :')" Perrie Edwards added: "Studio time! :) Just wanna say #TWOYEARSOFLM :D Two whole years! Wowza :) Love you mixers!"
Watch Little Mix's video for 'Wings' below: