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The Nickelodeon sketch comic who got her own show at 13, then carried a WB sitcom and a run of teen comedies from Big Fat Liar to She's the Man. She won Kids' Choice Awards for both television and film before announcing her retirement from acting in 2010.
America's freckled sweetheart of the mid-2000s — Freaky Friday, Mean Girls, a pop album, and a tabloid spotlight that never switched off. For a few years, Lindsay Lohan was the reigning teen-movie queen.
They started sharing one sitcom role as nine-month-olds and ended up sharing a tween-media empire: direct-to-video mysteries, sleepover parties on VHS, and a clothing line in every Walmart. For girls of a certain era, Mary-Kate and Ashley weren't celebrities — they were the brand of childhood itself.