United Kingdom, Oct. 24 -- Emma Stone changed her name to Riley for six months.

The 36-year-old actress discovered early on in her career that she couldn't work in the entertainment industry under her birth name of Emily Stone because there was already someone with that moniker registered with the actors union so she picked a "beautiful" stage name which she used for six months.

During an appearance on The Late Show with Stephen Colbert, Emma explained: "I actually adopted a stage name for, I would say, like six months. Because the Screen Actors Guild, it's like the Business Bureau. You can only have one person with that name.

"I was 16, and I decided I wanted to be Riley for like six months. So I was Riley Stone, which is a beautiful ...