Adam Lambert: David Cook's Ex?

3/19/2009 12:11 PM PDT BY TMZ STAFF
Here's brunette current "American Idol" contestant Adam Lambert on Tuesday's show (left) -- and blonde season two "A.I." wannabeen/former David Cook girlfriend Kimberly Caldwell a while back (right).

Adam and Kimberly

Only one of them uses too much foundation.

We're just sayin'.