It was one of several outfits The Born This Way singer wore during her performance, the sixth of seven that she is doing to mark the closing of the storied dance hall.
Fans went wild for her complicated look and mobbed her when she left the performance hall.
Blooming rose: Lady Gaga wore a silky body suit with a rose sewn over her pelvis as she exited her penultimate concert at the Roseland Ballroom in New York Sunday
Keeping them guessing: The singer wore a green-tinged fright wig with the very flirty outfit
According to the New York Post’s Page Six column, the performance was so sexy that security guards were forced to conceal the antics by drawing a curtain around the couple and 10 others in the area.
Gaga entertained the 1,200 strong crowd by writhing on a stage before meeting Taylor, who had arrived to the bash separately.
A source explained: ‘Gaga assumed a stripper persona and put on a show for him. She was doing a serious lapdance and they started making out. She jumped on a banquette, pulled Taylor’s face into her crotch, was stroking his hair.’
Inside the curtained area Taylor grabbed Gaga’s back as she sang the words ‘do what you want… with my body,’ from her recent duet with R. Kelly and she also spanked a female friend with a rose.
A grand sense of fun: Fans respond to the 28-year-old singer’s odd costumes
She’s turning Japanese! The body suit had a decided Eastern look
It seems Taylor, 32, was delighted by thee performance as sources claim he was overheard gushing about his girlfriend’s raunchy display.
He said: ‘I am the fire that stokes her imagination, and I’m happy to be that. We are all the fire that stoke her.’
On Sunday night, the 28-year-old still managed to belt out a fresh performance.
To perform a Tony Bennett song, Gaga vamped it up in a red bustier, black studded go-go boots, ripped fish-nets and blonde fright wig.
Dressed down Gaga: The singer wore printed trousers and a long-sleeved top as she was seen out in New York earlier in the day on Sunday
She changed from the red bustier to black and silver one as she knocked out more fan favourites while playing the piano.
Fans waiting for the singer responded with wide grins to the stunning body suit, that had a bit of a Japanese look.
The night before, the New York entertainer made a surprise appearance at BMP Nightclub in New York on Saturday for the Official Lady Gaga At Roseland after-party and showed off her pert posterior in a daring leotard.
Not shy: Lady Gaga took to the stage at the after party for her Roseland ballroom concert Saturday where she showcased her pert bottom in a revealing leotard
The star showed no signs of fatigue after performing at the Roseland earlier in the evening and put on an energetic performance at the after-show.
Gaga took to the stage alone as she strutted her stuff.
Her tattoo on her left thigh was clearly visible as through her fishnet stockings and she appeared to be in a world of her own as she showed off her moves.
Having a rear-ly good time! Gaga’s derriere was the main focus of attention thanks to her revealing outfit
Never body-conscious, the star twisted and turned to show off her body from every angle.
The ArtPop hitmaker is currently completing a seven-night residency at Roseland Ballroom, which will end on April 7, with the closing of the legendary New York venue.
The 52nd Street theatre is closing its doors after 56 years, and the G.U.Y. singer is the final performer to take the stage.
Cheeky! Gaga wasn’t shy about showing off her derriere as she crawled around on stage
‘It’s basically the only room in the city I haven’t played,’ Gaga told The New Yorker recently, noting that Manhattan clubs are ‘where I learned to be bold.’
The Roseland Ballroom will eventually be transformed into a 59-storey residential tower.
Gaga will then have almost a month off before she kicks off her ARTPOP Ball Tour May 4 at Florida’s BB&T Center in Ft. Lauderdale.
Work of art: Gaga showed off her various inkings in her revealing ensemble as she struck a pose on the stage