It's a story so unbelievable, it must be true. Anderson Cooper, author of "Vanderbilt: The Rise and Fall of An American Dynasty," tells Stephen what happened when his mother Gloria Vanderbilt discovered she could still carry a child at 85 years old. #Colbert #Vanderbilt #AndersonCooper

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Watch The Late Show with Stephen Colbert weeknights at 11:35 PM ET/10:35 PM CT. Only on CBS.

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The Late Show with Stephen Colbert is the premier late night talk show on CBS, airing at 11:35pm EST, streaming online via Paramount+, and delivered to the International Space Station on a USB drive taped to a weather balloon. Every night, viewers can expect: Comedy, humor, funny moments, witty interviews, celebrities, famous people, movie stars, bits, humorous celebrities doing bits, funny celebs, big group photos of every star from Hollywood, even the reclusive ones, plus also jokes.