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Since "Kardashian" is practically synonymous with "fashionista," it's safe to say Kourtney shares the same look-at-me style as her equally famous sisters and mother. But as a mom of three little kids, relaxed dressing is just as much part of her routine as high glamour.

On the red carpet, she can rock a sheer Balmain jumpsuit or a slit-to-the-hip Versace gown just as well as Kim, Khloe, and the rest of the girls. But when it's time to run errands, kids in tow, she's not afraid to dress down in sweatsuits or ripped jeans and sneakers. Of course, those sneakers are probably Gucci or some other outrageously priced kicks, and she's likely carrying one of her many Birkins. Well, "Kardashian" is also synonymous with "expensive taste."

Here, we take a look back at Kourtney's evolution from her pre-KUWTK days (yes, there was such a time) to the clan's current reign on reality TV. Get ready for a fashion show, Kardashian style!