Jennifer Lopez Steven Tyler American Idol
'American Idol' returns tomorrow with two new judges: Aerosmith frontman Steven Tyler and Hollywood Renaissance woman Jennifer Lopez. They'll critique a new cast of talent alongside the new big dawg on campus (and last original judge), Randy Jackson. But how will their personalities fill the gaping holes left by Simon, Paula, Kara and yes, even Ellen? We're not sure yet, but that doesn't mean we can't speculate. Both Tyler and Lopez have been in the biz for decades. And what better way do we have to decipher their judging abilities than by combing their careers for clues?

After the jump, learn what will make these music giants tick behind the 'Idol' judges' table.