QUIZ: Do you know the real names of these 19 celebrities who have deceived the world with their fake monikers?
If names like Olivia Wilde and Vin Diesel sound too good to be real, it's because they are. While seeking fame and fortune, a number of well-known celebrities have ditched their given names, which makes sense when you find out what their birth names were. Tom Cruise's original moniker, for example, would've hardly fit nicely on a movie poster. Test your knowledge of these 19 celebrities' pre-fame life and see if you can correctly choose their birth names.