Kate follows in Paris Hilton's fashionable footsteps

The Duchess of Cambridge, née Kate Middleton, stepped out in style on Thursday (Nov. 3) wearing a dress from label Self-Portrait, a brand she's never worn before. And it looksl like just one week prior to the royal's dazzling appearance, another famous face slipped on the $534 (£320) number: Paris Hilton. The socialite had stepped out in the same design at the amfAR gala in Los Angeles.

TAP TO VIEW GALLERYThe Duchess of Cambridge looked gorgeous in this Self-Portrait dress

Both Kate and Paris looked gorgeous in the long-sleeved gown, and showed off their individual senses of style by accessorizing in completely different ways.

While Kate, 34, paired hers with suede Gianvito Rossi heels, a Mulberry clutch and delicate pearl earrings, Paris opted for white heels, a crystal headband and statement drop earrings.

We can see why Kate and Paris chose to wear the dress; with pretty crochet detailing, a floral neckline and a daring slit in the pleated full-length skirt, it is a failsafe choice for easy glamour.

Paris Hilton wore the same dress last week

The duchess wore the dress to attend the premiere of A Street Cat Named Bob in her capacity as patron of Action on Addiction, the charity that helps those suffering from problems of addiction.

Kate had the opportunity to meet the stars, cast and crew of the film, including Luke Treadaway and, of course, Bob the cat!

Earlier in the evening Kate watched highlights of the Recovery Street Film Festival, which features inspiring films made by former addicts and their loved ones about life in recovery from addiction.

Kate learned about the creation of the festival, before watching the three prize-winning films and later meeting both the prize-winners and representatives from some of the charities involved in the festival.

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