The 'What About Us' singer hit Hylands Park in Chelmsford for the two-day music event - which saw the likes of Justin Timberlake and Ed Sheeran take to the stage - where she enjoyed a spot of relaxation in Virgin Media's Louder Lounge.
Clearly a seasoned festival fashionista, Vanessa hit the style mark in a sheer black skirt covered in a pretty white floral print, featuring a plain underskirt and a thigh-high slit.
Opting for a monochrome look, the songstress also wore a long-sleeved white lace top while keeping a black jumper on hand in case of any chills.
Vanessa ditched her wellies for the occasion, instead giving her ensemble a rock chick edge with a pair of lace-up heeled boots.
Her peepers were shielded with retro round sunnies and she lacquered her talons a summery aqua blue hue, completing her outfit with heaps of delicate gold jewellery.
And as always she showcased an unbelievably flawless make-up look too, flaunting velvety skin and bronzed cheeks along with a pop of Hollywood red on her pout.
Brunette bombshell Vanessa attended both days of the festival and was spotted enjoying the sunny weather in the exclusive Louder Lounge area with long-term boyfriend Gary Salter.
The starlet also seemed very happy to bump into her pal and former Made In Chelsea star Millie Mackintosh, who was accompanied by her hubby Professor Green.
It must have been nice for the trio to catch up, as earlier this month Vanessa, Millie and Pro Green enjoyed a night out partying together in Ibiza (and of course took an Instagram pic to document their evening!).
Other celebs milling around the Louder Lounge included Chelsea gal Louise Thompson, 'Broken Heels' singer Alexandra Burke and Liverpudlian WAG Coleen Rooney.
They were treated to intimate acoustic concerts at the Sony Xperia stage as well as their choice of delicious food including Big Apple Hot Dogs, Le Bun American French Burgers and Dum Dum doughnuts (yum!).
There was even a spa area where the Mark Hill team tended to wind-swept locks, while Eylure kept lashes and brows in tip-top shape and Elegant Touch spruced up any lacklustre manicures.
No wonder Vanessa couldn't stay away!
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