Sir Mick Jagger's girlfriend admitted it is "really hard" to keep their son grounded

She told the Sunday Times Culture magazine: "It's a very nice apartment, but it's not a hotel. He helps me with the laundry, he helps me cook dinner. We take the subway."

But one such trip ended with a "parenting fail" after Melanie and Deveraux volunteered at an animal shelter and were left distraught when they couldn't rehome all the kittens.

She recalled: "Oh my God, that was a parenting fail. We were both on the street crying, and Mick's [on the phone], like, 'Just take the cats!' "

The family travel frequently, with Deveraux enrolled in a school in France, where they have a chateau on the Loire River, or has tutors when they are on the road.

Melanie said: "Mick can't stay put and I'm similar. I'll say, 'I want to stay put.' Then after two weeks, I'm, like, 'Where are we going?' "

The Rolling Stones frontman is 44 years older than Melanie - who he first met in 2014 - but she insisted she "doesn't think" about the age gap and doesn't care what other people think of their relationship.

She said: "I don't think about it.

"Everyone's going to have their opinion. If you think about others' opinions, no matter where you are in life, you're going to have a problem and you're going to analyse it.

"I put the blinders on. Am I happy? Yes. Are the people in my life happy? Yes. Am I hurting anyone? No. OK, they can mind their own business."

And Melanie insisted she was never starstruck by the 'Sympathy for the Devil' hitmaker.

She said: "Ballet dancers meet some of the biggest stars and act, like, 'Who are you?' Because, to us, ballet dancers are the gods. That's who you study and look up to. You're so in your world."

The 'Unraveling' author experienced the "highlight of [her] life" last September when she and her partner attended a dinner at the Palace of Versailles in honour of King Charles and Queen Camilla.

She gushed: "It was the highlight of my life. Mick's, like, 'How many times can you mention Versailles at a dinner, Melanie?' "

But at the banquet, a man sat between Melanie and Camilla, turning his body to face the queen and cutting the former ballerina out of the conversation.

She recalled: "He didn't do the lean back [position].

"[Camilla is] really sweet because she tried leaning forward a couple of times."