The 41-year-old singer took to the stage at Wireless Festival, donning a rubber bodysuit.
Performing classic hits such as 'Glamorous', as well as new song 'MILF$', the singer changed outfits several times throughout the show, reported Digital Spy.
Fergie also performed a series of Black Eyed Peas hits, including 'Hey Mama' and 'I Gotta Feeling'.
During the show, a fan reportedly tried to climb over the barrier, though was stopped by a security guard.
The singer is expected to release her long-awaited second album Double Dutchess later this year, having also teased singles 'I'm Already Here' and 'Hungry'.