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Kourtney Kardashian Mason son mother sister Kendall Jenner step-sister jumpsuit legs sandals black plaid shorts daisy dukes flip flops cup iced tea drink straw sunglasses

Kourtney Kardashian took younger sister Kendall Jenner along for the ride when she and Mason made a Starbucks run Saturday in Calabasas.

See what those long-legged Jenner genes will do to a person -- 15-year-old Kendall is a foot and a half taller than her older sis!