Richie makes a fashionable book-signing appearance in L.A. Plus: Justin Timberlake, Khloe & Kim, Katy Perry and more

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WEIRD SCIENCE

Actor-musician Justin Timberlake tries his hand at a new calling Wednesday – science! – during an appearance on Spanish TV show El Hormiguero with Social Network costars Jesse Eisenberg and Andrew Garfield (not pictured) in Madrid.