Like the name of her 2014 hit, Katy Perry came over all ‘Extraterrestrial’ on Thursday night.

Slipping into something silver for the afterparty, the musician looked positively space age as she joined A-list guests after amfAR’s 23rd Cinema Against AIDS Gala in Cannes.

Katy ditched her Spanish-inspired red-hot Flamenco dress in favour of a slinky metallic number, complete with kooky pom-pom earrings.

Katy’s ensemble nipped in at the waist and skimmed over her bust with fringing revealing her nude undergarments beneath.

Silver heels and a matching clutch bag completed the iridescent image as she made a quick change with her raven locks and headed for Hotel du Cap-Eden-Roc post-party sponsored by Moncler.

Though unaccompanied by Hollywood hunk and new beau Orlando Bloom at the afterparty, Katy was in high spirits, posing against the kooky wallpaper and talking to Markus Molinari.

Also continuing the party into the night on Thursday was actress Elle Fanning and fellow silver screen star Adrien Brody.

The model army led the way though, as Karlie Kloss, Barbara Palvin, Heidi Klum and Petra Nemcova headed to the Moncler afterparty.

Musician Katy arrived at the star-studded gala event that night in striking off the shoulder and full-length Marchesa gown in scarlet.

The 31-year-old put on a jokey display alongside her beau Orlando, who had arrived to support the star ahead of her performance at the event. 

Katy couldn’t resist pulling funny faces as she photobombed her boyfriend during the star-studded gala.

Featuring dramatic ruffled sleeves and and an exquisite floral hemline, the Roar hitmaker ensured she pulled out all the stops when she arrived on the red carpet.

Later, she even made one further costume change when she performed at the event in a gold fringed outfit and thigh-high boots.