Robin Williams visited "The Late Show with David Letterman" on Wednesday. The "Night at the Smithsonian" actor had heart surgery eight weeks ago. "I have one new valve and a repaired valve," the comedian joked. "I have a cow valve, which is great, and the grazing's been fun." Ray Tamarra/GettyImages.com - May 13, 2009
Week In Photos: May 10-16, 2009
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