Jessie J keeps it regal in a photo shoot for this week’s Grazia magazine Jubilee special.

The singer, who is looking forward to performing at the Diamond Jubilee Concert, said: “When I got the letter asking me to perform, I felt really proud. It’s a proper letter from the Queen’s secretary. I’m keeping it in a memory book. It’s written on this lovely thick notepaper. I keep feeling it.”

Speaking about the final of BBC talent show The Voice, Jessie, one of the four judges, told Grazia: “It’s been an honour to be part of a TV show that celebrates the voice. It will be a massive night for the artists, coaches and crew.”

She added: “I love working with my team. Plus, I see a lot of myself in Becky. I thought the BBC was making a mistake asking me to do it in the first place. I kept saying, “People might not know who I am!””

Addressing rumours of her ‘diva’ behaviour, she added: “There isn’t anything flash in my dressing room. No champagne. No yoga mats or anything. That was meant to be one of my diva demands. I did ask for a scented candle. I don’t think it’s too much to ask for a nice, relaxing smell in the room. I also asked for a lava lamp. When I was a kid, they used to have a room at Great Ormond Street Hospital where you’d go and chill out. It was full of lava lamps and water lamps and since then it’s always been a way to help me wind down. I never got one, and that’s OK. But is there anything wrong with asking for what you know is good for you? Does that make you a diva, a pain? Or does it make you someone who knows what they want?”

It’s four years since Jessie wrote her first album – and the singer admits she’s ready for a style-over. “I started to look like a cartoon character with the fringe and the catsuits,” she says. “I ended up looking like a transvestite. I want to change my hair, change my style. I want to be allowed to grow.”

“I get to go out on stage and see thousands of people singing the words to my songs and that is – for me – the dream experience.”

The full interview appears in this week’s Grazia magazine, on sale now (Tuesday). Tickets for Jessie’s 2013 ‘Nice To Meet You’ arena tour are available now.