We search for the American Idol alums that you didn't know also started on Broadway, from Adam Lambert to Katharine McPhee.

"So I'm guessing you come from a musical family," judge Carrie Underwood asked the singer before the truth came out.

Don't get me wrong, Katharine McPhee was amazing — but her triumph over the rock star in season 5's Top 4 elimination was ...

I ranked the best 'American Idol' auditions of all time, from Abi Carter's viral rendition of Billie Eilish's "What Was I ...