One of the most popular recording artists on the planet right now is Lady Gaga. It's a pretty safe bet that she would not be enjoying the level of success she's having right now by using her real name of Stefani Joanne Angelina Germanotta.
Michael Keaton's real name is Michael Douglas, but there was already a famous Michael Douglas in the Actors Guild. So instead he chose the surname of an actress he admired, Diane Keaton.
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