http://tags.gawker.com/assets/base/img/thumbs140x140/gawker.com.png http://gawker.com/tag/defamer/babymath http://gawker.com/tag/defamer/babymath David Letterman and Julia Roberts were reunited on last night's Late Show, and it didn't feel so hot. The self-exiled Most Powerful Actress in Show Business seemed to us unnecessarily hard on the host and gushing dad, who was trying to make some point about celebrity baby-math (something about exponential levels of household chaos, not the old adage about knocking $5 mil off the opening weekend for every pregnancy). He was swiftly made to look the buffoon by the Charlie Wilson's War star and her rigidly literal-minded interpretation of family-sizes. And no one makes Dave look the buffoon—well, except maybe Julia. [Late Show]

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