Bruce Willis talked to David Letterman Wednesday about the hottest new plaything in his life -- and it ain't Twitter.

Discussing his recent nuptials to gorgeous Maltese model Emma Heming, the 54-year-old "Sixth Sense" star joked with Letterman about the couple's May-December age difference.

"She's a little younger, she turns 18 in about two weeks," Willis said .

Willis told the late night host that he originally spotted the 30-year-old Heming working out at a gym he frequents and, at first sight, said: "Wow! Who is that!'"

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• Bruce Willis
• celebrity weddings
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