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See the Cast of 'This Is Us' Then and Now

The 'This Is Us' cast is in the spotlight right now, with millions of viewers tuning in to the pilot and staying week after week, becoming mega-fans of the heart-wrenching NBC drama. It's not that surprising, given that the 'This Is Us' TV show was branded the "surprise breakout hit" of the fall 2016 season. Clearly, people are in love with the show's storyline--and with the This Is Us cast, a group of actors and actresses who feel new but yet already so familiar to us--and many of whom have actually been around for a long time.

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While some stars of This Is Us were pretty big names already, like Mandy Moore and Milo Ventimiglia, there are also some wonderful lesser-known actors and Hollywood rookies making a name for themselves on this hit show, which has already been renewed for two more seasons. But even if you think the 'This Is Us' cast feels so familiar, it's still fun to see what they were up to five, 10, or even 15 or more years ago.

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Take a most revealing peak into their past by looking at old photos of the 'This Is Us' TV show cast. Some of these stars have undergone huge transformations--while some look pretty close to how they do now, on our TV screens week after week!

See the 'This Is Us' cast change right in front of you in the video below.