Madonna, who has shocked fans with outrageous antics during her Australian tour, has used her Sydney concert to tell the world of her passion for Game of Thrones’ towering actress Gwendoline Christie.

Gwendoline Christie in GoT garb. HBO

The Material Girl last night called the 191cm tall Christie on stage at Allphones Arena, then slapped the actress on her behind.

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“I worship you, you’re my favourite,” Madonna told Christie.

“I love the way you kick arse baby, I want to be you. You teach me some of your moves and I’ll teach you some of mine.”

Christie, who plays Brienne of Tarth on GoT, responded, “I’ve loved you my whole life”. Madonna then declared, “I want to f**k you”.

“Right back at you Madonna,” the actor said.

The controversy follows an incident at her Brisbane concert, where Madonna exposed the breast of a 17-year-old who’d been called onstage.

The teenager, Josephine Georgiou, ridiculed suggestions she could sue the singer.

“Seriously, why would I sue Madonna for the best moment of my life?,” she told The Courier Mail.

“It was the best night. She was calling me a Victoria’s Secret model the whole time I was on stage, which is so flattering.”

Georgiou said she was wearing her mother’s corset and it was too big, which meant she was adjusting it on stage while Madonna was talking to the crowd.

She added she was not offended by the incident.

“Only I get to decide if I’m humiliated or not, why would people assume I am humiliated by my own breast, nipple or body?, Georgiou said.

“It’s hilarious to me how much of a big deal it is to everyone, people just need to understand I was on stage in front of Madonna, I was looking her in the eyes and most people would just melt into a pool on stage, so it was only because I was standing in front of her that I looked so surprised.”

Piers Morgan has attacked Madonna for her behaviour. Getty.

She also denied claims the incident was staged and insisted she was randomly plucked from the crowd.

Piers Morgan, writing for mailonline, attacked Madonna for her behaviour and labelled her a “dirty old woman”.

He wrote: “Imagine if you were a male celebrity in that position? What do you think would happen to you?

“First, there would be universal revulsion.

“Second, there would be global media fury.

“Third, you would almost certainly face arrest for lewd conduct and/or sexual abuse.

“In America, where this girl would be categorised as a minor, there wouldn’t be any doubt about it; this would be a criminal offence.

“In Australia, where the girl is legally deemed an adult, any charge would depend on her willingness to complain to police – which she doesn’t want to do as she’s a huge fan of the celebrity concerned.

“If Mick Jagger had done this on stage to a 17-year-old girl, all hell would break loose and rightly so”.

With AAP