Sliding down a gigantic tongue in an eye-wateringly skimpy pink leotard, Miley Cyrus kicked off her 23-date European tour with a burst of expletives.

She certainly started as she meant to go on.

Within the first ten minutes, we had crotch-grabbing, grinding and yet more foul language — building to impassioned rants in which she encouraged drug-taking and kissed someone of the same sex.

Having foolishly agreed to take my daughter Elsa, soon to be 15, to the show at London’s O2 arena, I was to endure two hours of the most inappropriate display by a pop star I have ever seen.

Although tickets specify under-15s must be accompanied by an adult, that hasn’t stopped the chaperones inundating the lewd singer’s management with complaints about the explicit content. Knowing all this, why did I allow my daughter to attend? Like many others, it comes down to a mixture of naivety and ignorance.

Elsa grew up with Disney’s Hannah Montana — of which Miley was the wholesome star — and has watched her transition from clean-cut girlie girl to international wild child. She was keen to see Miley’s only concert in London and, despite the star’s notoriety, I really hadn’t imagined it would be as extreme as it was.

Stupidly, I thought there’d be due consideration given to the young age of her fans.

Twerking girl: Miley Cyrus mixes childish images with outrageous routines

She hasn’t changed: Miley performs provocative moves onstage at London’s O2 arena

She likes the high life: Miley wore Marijuana leaf shades with a gold chain to match

Bum deal: Miley couldn’t seem to resist flashing her derriere to her audience

Still with the tongue: Miley took a selfie onstage during the gig

Working out: No doubt the singer’s regime helps to keep her fit and in shape