The American designer hosted a star-studded party at celebrity hotspot the Chiltern Firehouse on Monday night, to celebrate the launch of his new fragrance Noir Extreme.
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Alexa showed off her holiday tan in a strapless little black dress, which she teamed with a pair of strappy black heels.
The British model kept her make-up to a bare minimum, and wore her brunette bob down in loose waves for a laidback yet glamorous look.
Tom himself also opted for a handsome black ensemble, wearing a black suit and patent shoes, adding a white shirt for his signature tailored style.
Fashion's elite including David Gandy, who was joined by girlfriend and The Saturdays' singer Mollie King, stepped out to support Tom in his latest venture, as well as singers Paloma Faith and Lily Allen who showed off their individual style for the event.
While Paloma opted for a glitzy multi-coloured, long-sleeved bodycon dress, Lily chose a more casual ensemble with black leggings and a burgundy top, teamed with a pair of combat boots. TV presenter Graham Norton also made an appearance for the glitzy night out.
David Gandy and Mollie King also made an appearance
Tom caused a stir in the industry last year when he revealed that he will be showcasing his Autumn/Winter womenswear collection in Los Angeles rather than London for Fashion Week in February.
"I love London and I am not abandoning London Fashion Week," he told WWD. "It's a one time thing, it made sense for me, and I plan to be back in September."
The 53-year-old admitted that his decision to move the catwalk presentation was due to a scheduling conflict with the Academy Awards ceremony in February, which will fall during London Fashion Week.