Kevin Spacey has already proven himself to be a master of celebrity impressions, and during an appearance on the Late Show with David Letterman on Monday, he pulled out all the stops. The actor started the show off with a bang by impersonating his mentor and friend Jack Lemmon before revealing that he met Jack when he was just 13. Kevin then followed up with a Johnny Carson monologue that only he could pull off so well. Watch the clip above, then check out Christina Aguilera's hilariously spot-on Britney Spears impression.
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