The 36-year-old model, whose sense of style has not only made her a fashion favourite but also led to a successful collaboration with Topshop, looked effortlessly chic as she arrived at the island's annual music festival on Saturday.
Sporting new longer blonde tresses, Kate was spotted backstage at the event in a pair of denim cut-offs, a fur-embellished jacket and red ankle boots that perfectly complemented the laid-back feel of the weekend.
The mum-of-one, currently dating rocker Jamie Hince, wasn't the only model nailing the trend.
Fellow catwalk beauty Erin O'Connor, who was at the festival with boyfriend Dan Stewart, teamed her silver sequinned disco top with a pair of heart-shaped sunglasses and some very practical wellies to stroll around the site.
Alexa Chung, meanwhile, went for a country life-inspired ensemble featuring a Barbour jacket and black skinny jeans.
Highlights at the festival, which was attended by 55,000 people, included performances from US rapper Jay-Z, The Strokes, Blondie and Pink, who made a dramatic entrance by descending from a box suspended high up in the air.
But the star of the show was Paul McCartney.
The iconic Beatles musician headlined the final day with a sensational set that included a tribute to Jimi Hendrix, who famously played the festival 40 years ago - his last major event before his untimely death.