The singer turned heads when she stepped out in this absolutely stunning Saint Laurent dress which was splashed all over with teeny-tiny diamantes and that boasted a very daring thigh-split - but it was her tresses that really caught our attention!
A few weeks ago we spied Ms. Perry rocking raven tresses but it seems the star got tired of her vampy look as she unleashed her inner Jessica Rabbit and ramped up the glam-factor a la actress Bella Thorne.
How beautifully do those Hollywood waves offset her flawless complexion?
Katy dazzled under the bright lights and played by the beauty rule book when it came to her make-up. Choosing to accentuate her mesmerising green peepers, Katy looked every inch the red carpet queen and smouldered thanks to her gold-washed lids and a dab of carnation pink lipstick - beautiful!
Katy posed hand on hip and grabbed photographer and good pal Jean Paul Goude for a few snaps before heading inside the venue to enjoy dinner and champagne.
This 'do is most definitely a keeper.
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