Lady Gaga bares her behind and cuddles up to a topless male dancer as she enjoys a big night of club-hopping in Sydney

She had already surprised nightclubbers earlier in the night when she slipped into an eccentric leather Iris van Herpen dress and lace shroud. 

But in true Lady Gaga style, she certainly didn't fail to shock even further, when hours later she moved onto another top gay club, the Arq. 

There, the 25-year-old slipped on a two-piece bikini that barely covered her rear.

Eyeful: Lady Gaga slipped into a revealing two piece outfit that showed off the singer's curvaceous derrière for a surprise performance at The Arq in Sydney on Monday night

Leaving very little to the imagination, the Madonna-inspired gold embellished ensemble appeared to cover up the singer more than normal at the front, but as she turned around she gave audiences an eyeful of her curvaceous derrière. 

And of course the raunchy antics didn't stop there. 

The Born This Way singer also got up close and personal with some topless male dancers during the energetic performance. 

Whipping her hair back and forth: Gaga gave one of her most energetic performance at the popular gay club

Raunchy: The Born This Way singer also got close with some topless male dancers during the energetic performance

She also whipped her hair in all of it's two-toned blonde and mint green glory, back and forth. 

Gaga stunned Sydney partygoers when she first made her first surprise appearance at one of the city's top gay clubs, Nevermind, earlier in the night. 

And once again there was no danger of her blending into the crowd as she arrived at the venue at 11:15pm in a leather Iris van Herpen dress and lace shroud.

That's a bit rude: A male dancer watches as the 25-year-old touches herself provocatively on stage 

Crowd pleaser: The crowd clearly couldn't get enough of the pop star 

The cream-coloured shroud covered Gaga's face, reminiscent of Charles Dickens' forlorn character Miss Havisham.

After some time in Nevermind, she changed into a purple PVC dress and multi-coloured jacket for her exit, before moving on to the Arq.

Although Lady Gaga's appearances at the venues had been not been announced, the manager of Nevermind had earlier promised customers a top secret surprise guest.

Cover up: Lady Gaga arrives at Sydney gay club Nevermind in a structured dress and lace shroud t

Can you see? It looked like Lady Gaga was struggling to see through the lace shroud as she navigated her way into the club

Inspiration? Martita Hunt as rich spinster Miss Havisham in the 1945 film adaptation of Charles Dickens' Great Expectations

Before her nightclub appearance, she dropped hints on her Twitter page about where she would be going.

She wrote: 'Thinking of going out in Sydney tonight. How I wish we had a show.

'NEVERMIND, don't listen to me. Maybe I'll just go for a walk in the pARQ.'

Gaga's surprise appearance at the clubs came after she was named honorary citizen for Sydney.

Presenting her with the title, Mayor Clover Moore said: 'Lady Gaga has been a powerful force for the gay and lesbian community in Sydney and we have a rare honour for people whose achievements embrace the ideals and spirit of our city.'

Meanwhile, Gaga appeared to channelling another fictional character on Sunday - 101 Dalmatians villain Cruella De Vil.

Eclectic: The singer changed into purple PVC and a military-style hat before leaving the Nevermind nightclub

Leaving her hotel in the harbour city, the New Yorker wore a black fitted jumpsuit which had an oversized bat-like shoulder cape which she paired with white gloves and spiky black heels.

The 25-year-old accessorised with a black-rimmed hat with a white trim but it was her locks that drew the most attention.

She finished off her two-toned look with jet black hair on the left side of her head and peroxide blonde on the right.