media_removed_toofab 102011

Justin Timberlake
celebrates his 31st birthday today -- and he's come a long way since his days on "The Mickey Mouse Club."

JT was one of many who hit it big after starring on the Disney show, coming from a crop that included Britney Spears, Christina Aguilera, JC Chasez, Keri Russell and even Ryan Gosling.

Since his time as a Mouseketeer, Justin once again teamed up with JC in *NSYNC before eventually going solo. He has since ditched singing ... hopefully just for now ... and has found new fans acting in flicks like "The Social Network" and "Friends with Benefits."

He reportedly got engaged to longtime girlfriend Jessica Biel over the holidays.

How well has the rest of the MMC held up over the years? See the fun side-by-sides in the gallery above and see what they've all been up to lately!

Also, for fun, check out this gem of a performance with JT, Gosling and JC:

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