Kate Middleton and her husband Prince William stepped out for a screening of David Attenborough's "Natural History Museum Alive 3D" in London on Wednesday.

The Duchess of Cambridge looked lovely in a floor-length Alice Temperley black lace dress that showed off her incredibly slim, post-baby figure. Known for recycling her clothes, she wore the same dress last year to the London "War Horse" premiere. It still fits after baby!

Kate gave birth to son George Alexander Louis in July. Rapper Kanye West recently said his and Kim Kardashian's five-month old daughter North should be considered royalty and her status equal to Prince George, the first-born child of William and Kate.

In an interview on Power 105's Breakfast show last month, West declared: "My daughter is in a position of a level of royalty like the prince and princess in London."

Whatever you say, Kanye.

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