The soon-to-be-legal blonde told our cameras today that Mario Lopez -- whom we spotted with Hayden's mom last week -- was a bit out of her age range. "He's a good friend, a very nice guy," she said, adding, "I think he's a little old for me." Since when is 34 too old?

Hayden was arriving for an appearance on "The Late Show with David Letterman." If Mario is too old for Hayden, then Dave, 60, is way, way too old for her.

COUNTDOWN TO HAYDEN'S 18TH BIRTHDAY: