Happy 30th birthday, Kate Middleton! The Duchess of Cambridge celebrates a milestone on January 9th, and we're right here to send lots of good wishes her way. In honor of her big day, we've rounded up her most memorable outfits, from casual jeans to day dresses to formal looks to wedding gowns (our five favorites are above). Check out our top picks in the gallery now! Then, tell us: Do you like her style? Let us know in the comments!