New York Mayor Rudolph Giuliani knows when to share the stage - and when to ground the hottest act in town.

Giuliani's son, Andrew, has been the talk of New York since the Jan. 2 inauguration, when the moon-faced 7-year-old joined him at the podium, blowing kisses, mimicking the speech and spilling water on his father.Andrew's antics became fodder for editorial writers and cartoonists and were satirized by David Letterman and NBC's "Saturday Night Live."

But Giuliani left the kid at home Monday when he appeared with Letterman on CBS's "The Late Show."

"I don't know if anyone can handle Andrew," the mayor said, as Letterman feigned sympathy.