It's pretty easy for us to recognize our favorite actors in a crowd because their faces seem so familiar. But their voices? Now that's another story!

Since many stars are multi-talented, they often lend their vocal to animated projects to help bring cartoon characters to life. While some of these roles are easy to recall (we're looking at you, Idina Menzel in 'Frozen'!), other are, well, totally surprising.

Check out the gallery above to see celebs who voiced cartoon characters!