20/20 Throwback: 23 Celebs When They Were 20

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Britney Spears and Justin Timberlake at the premiere of Crossroads
Kevin Winter/Getty Images

We've got 20/20 vision in 2020! We're taking a look back at some of the biggest celebs from when they were just bright-eyed 20-year-olds. Some, like Madonna, weren't famous yet, but you definitely knew Britney Spears and Justin Timberlake well by the time they turned the big 2-0.  See what even more A-listers looked like at age 20 by clicking through the gallery.