PRINCESS Kate was spotted sipping on a cocktail and flashing skin as she enjoyed a secret rave at a music festival.

Kate Middleton, 41, is said to have attended a 24-hour rave held on a Norfolk estate owned by a pal of hers and Prince William at the weekend.

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It was reportedly the Princess’ first-ever music festival – albeit very posh.

A photo has now emerged on Twitter of Kate, standing chatting away in a circle of people with a cocktail in hand.

The Princess donned an off-the-shoulder shirt in the photo – which is said to have been snapped at Houghton Hall.

Kate was reportedly having dinner with her Norfolk neighbours, the Marquess and Marchioness of Cholmondeley, David and Rose, at their grand home over the weekend.

Their estate covers 1,000 acres and at the time the Houghton Festival was taking place on their grounds.

Insiders said she was then convinced to head along to the secret, day-long rave.

A source told the Daily Mail: “After dinner, one of the guests suggested that Catherine go to the festival.

“Catherine was nervous about the idea, but, after much discussion with her protection officers, she went with lots of security. William wasn’t there.”

Kate was also said to have been enjoying posh food and loads of wine.

A source told the London Evening Standard that Kate was “in high spirits, ordering spicy margaritas, eating affogato [an Italian coffee-based dessert], and speaking affably with the other members of her party”.

The insider said: “Her companions apparently carted in a huge, balthazar-sized bottle of AIX rosé and, together with Kate, left the festival restaurant staff a £700 tip.”

The event, billed as Britain’s only 24-hour music festival, was first launched in 2017 by DJ Craig Richards.

It ran from last Thursday to Sunday and featured more than 200 artists performing across 13 stages with music always playing somewhere at the site.

Some 12,000 party-goers were expected to attend.

While it’s not clear why her husband Prince William didn’t go with her, it was the Glorious Twelfth on Saturday and it’s speculated he could have been out grouse-shooting.

A spokesperson for Kensington Palace declined to comment when approached by The Sun earlier this week.

Kate is well-known for strutting her stuff on the dancefloor.

In 2008, when she wasn’t a princess, she was seen at a roller-disco with pals, including the jockey Sam Waley-Cohen.

While two years earlier she was seen cutting some moves at Richard Branson’s Summer and Tennis Party at the Kensington Roof Gardens in London.

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