Let's make this birthday one to remember.

39 years old (Born on June 13, 1986)

Happy Birthday, Mary Kate Olsen! From delivering double trouble with your sister Ashley on "Full House" to redefining fashion through your effortlessly chic style, you've truly mastered the art of multitasking—actress, designer, businesswoman—and still making it look seamless! Let's face it: most kids can't manage fifth-grade homework without meltdown — yet you practically built an empire.

Recently, you've stunned the world by seamlessly transitioning into a successful producer and author while keeping us intrigued with iconic outfits. Cheers to another year elegantly balancing fashion runways and boardroom meetings. May today bring you happiness as timeless and delightful as reruns of "It Takes Two."