The supermodels celebrated fashion photographer Mario Testino's 60th birthday at London hotspot The Chiltern Firehouse on Wednesday night - and let's just say they made an effort on the outfit front.
Both ladies embraced vintage glamour in their low-cut, floor-sweeping gowns. Yes, they're in their 40s, but Kate and Naomi reminded us exactly why they're two of the world's most famous models.
Kate wore a sheer red dress over her Stella McCartney leopard print bodysuit. She completed her look with 1940s-inspired side-swept curls and a matching scarlet lipstick. Vamp, or what?
Naomi complemented her best pal's look in an equally dazzling ensemble - a slinky silver gown paired with a diamond snake-shaped necklace and a chic updo adorned with red roses.
With these two to get the party started, we imagine Mario - who was suited and booted in a white tuxedo jacket and bow tie - had a blast.
They weren't the only celebrity guests, either. The famous fashion duo were joined by Lara Stone and David Walliams, Sienna Miller - who wowed in a little red dress - Rita Ora, Tinie Tempah, Poppy Delevingne, Stella McCartney and Keira Knightley.
It must have been quite the party. Happy birthday, Mario!
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