The singer, 22, wore black shorts which came just above her new tatts, and a tummy-skimming cropped t'shirt to the gig at the Staffordshire theme park.
Jesy's new body art includes the quote "a tiger never loses sleep over the opinion of sheep!" etched across her right thigh, while "music is the strongest form of magic" is on her right arm.
The right arm ink is a quote from fellow singer Marilyn Manson.
Along with bandmates Perrie Edwards, Leigh-Anne Pinnock and Jade Thirlwall, Little Mix were one of many acts performing at the all-day event.
Rizzle Kicks, Stooshe, Conor Maynard, James Arthur and Union J also performed, supporting the main act Olly Murs.
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Watch Little Mix perform 'Wings' below: