It's a common stereotype that actors lack book smarts. But as Yahoo Finance recently pointed out, that's not always the case.
The website put together a list of 30 smartest stars, with Natalie Portman, Ashton Kutcher, James Franco and Quentin Tarantino all among the brainy bunch.
It's a no brainer for some who made the list, but a few are sure to make you scratch your head.
Here's a look at our favorite 10. Visit Yahoo Finance to view the complete list.