When "American Idol" premiered in 2002, nobody had any idea it would become the juggernaut it is today.

With the show's 12th season debuting tonight with Mariah Carey, Nicki Minaj, Keith Urban and Randy Jackson, we thought we'd take a look back at the contestants from when it all began ... and see what they've all* been up to since.

Over the past 11 years, contestants like Kelly Clarkson, Justin Guarini, Nikki McKibbin and Tamyra Gray have given us some amazing music, train wreck reality TV moments and even a movie called "Eating Out" ... seriously.

While Kelly has gone on to become the most successful "Idol" alum of all time, what happened to everyone else?

Check out the gallery above to see what they look like now ... and what they've been doing since 2002.

*All except Christina Christian. We have no clue where she went ... and can't find any recent photos of her anywhere!

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