Little Mystery Bird

I glanced out the window at my bird feeders this morning and saw a new visitor.  Well, I never actually saw it eating, it was just fighting its reflection in the glass. It looked to me like a baby American Finch with a dab of orange Dayglo paint on its head.  But the bill doesn't match that of a finch.  I had never seen anything quite like it.

I got out my Peterson Field Guide, and still didn't find a match.  In fact, I found nothing in the book with a color like that on its tiny head.

If anyone has any ideas, let me know.  And have a great Sunday!