The Born This Way singer arrived at the Guggenheim Museum in New York atop a red convertible, before making her entrance in a typically bonkers floral robe.
Once inside, the eccentric singer launched her debut fragrance from inside a life-sized perfume bottle where she received a tattoo while applying make-up and playing on an Ipad. Oh and then Gaga pee-ed in a bowl. Like you do.
The masquerade black tie event featured a few hundred people dressed up in eye masks and headgear, with celebrity attendees including Paris Hilton, Yoko Ono, Alexander Wang, Jason Wu and Lindsay Lohan.
Beauty writer Cassie Steer spilling the beans on the bonkers bash: 'Last night will certainly go down as one of the more surreal of my life. From the fabulous venue, to the people (hanging at the bar with Marc Jacobs for one) and the, er, pee (as part of her performance art Gaga relieved herself in a bowl!).
Will you buy a bottle Lady Gaga's perfume (bear in mind it's made up of notes of sweat, blood and semen)? Let us know what you reckon in the comment box below.
