Jess Glynne partied until the early hours of Sunday morning – just hours before she pulled out of her set at the Isle of Wight Festival, according to reports.

According to The Mirror, the singer had been partying with Spice Girls and others, following the conclusion of their World Tour.

Festival boss John Giddings has criticised the singer’s “shocking behaviour”, and said: “She will never be booked to play the Isle of Wight again.”

Jess, 29, who supported the Spice Girls at Wembley Stadium on Saturday, stayed for the star-studded backstage party, which included singer Adele, 31 – according to reports.

It’s said that Jess was seen leaving Wembley at 5am on Sunday with a group of friends and Spice Girl Mel B – and reportedly continued the party at a nearby hotel until at least 7am.

As source said that a car picked up Jess at 9am to take her to the Isle of Wight. She was due on at 6.30pm, and her band were there and the stage was prepared for her set.

Mr Giddings went on stage to announce her set was off, leaving some fans in tears – and thousands disaappointed.

John Giddings. Photo by Robin Crossley

Mr Giddings told The Mirror:

“It shows no regards for people that bought a ticket. It’s so sad that an artist would do that to their fans. She’s let them down.”

Her management blamed her no show on exhaustion, before Jess tweeted the following:

“I got ready and was about to head to stage, but I just couldn’t do it.

“I was incredibly weak and full of anxiety. I can’t help that my body sometimes gives up on me. I am so, so gutted, sorry and upset I couldn’t perform.”

The Isle of Youth Trust has tweeted its support to the singer.

Jess also pulled out of the Isle of Wight Festival in 2015 when she had vocal surgery.

Last month (May) she failed to show at BBC Radio 1’s Big Weekend in Middlesbrough after losing her voice.

Revellers partied at the Isle of Wight Festival included Fatboy Slim, George Ezra, Bastille, Ricky Astley and Biffy Clyro.