The pop superstar headed to the 20th Annual Watermill Centre Summer Benefit on Saturday (27 July), and looked almost unrecognisable as she debuted her new look.
The 'Bad Romance' singer stayed away from her usual eccentric choice of clothing but still made a statement, as she wore a combined sheer and leather fitted dress.
The gown featured a large cutout panel at the front showing off Gaga's black lace bra.
She teamed her outfit with chunky black laced up boots and clutched onto a brown package as she hung out with Serbian performance artist, Marina Abramovic, who has been working with Gaga on her highly-anticiapted new studio album ARTPOP.
While Gaga kept her outfit strictly all black, she looked fresh-faced wearing barely any make-up which highlighted her bleached eyebrows, brunette hair and septum piercing, which she unveiled last week.
Gaga - real name Stefani Germanotta - is gearing up for her chart comeback later this year with ARTPOP and has taken to Twitter to tease fans about her forthcoming single 'Applause', releasing promotional images ahead of its debut.
Check out some of Gaga's most bizarre outfits below!
Copyright: Rex Features