Do you actually know the name of your favorite celebrity?

Although it may not always be obvious, some of the biggest celebrities go by a name other than their own. Michael Keaton Unpleasant Gigi HadidA surprising number of artists are adopting stage names—and it’s not just because they want to channel Hannah Montana and have the best of both worlds.

In the case of Michael Keaton, whose real name is Michael Douglas-the Beetle juice star dropped his original moniker to comply with the Screen Actor’s Guild rule that no two members may have the same name. And because the Wall Street actor Michael Douglas and talk show host Mike Douglas When he met those conditions, he chose another nickname.

As it turns out, Emma Steen—known to friends and family as Emily Steen—had a similar experience. But both actors have revealed that after years of building a brand with their stage names, they’re trading them in for the real thing. And while it may take some getting used to, these talented actors are bringing a new level of authenticity to their work.