Garth Brooks and Trisha Yearwood have been married for 18 years (since 2005)! That's an eternity in Hollywood! It has now come to light that Trisha really wanted to legally change her last name to Brooks, but Garth said he didn't want her to. 

It is quite unusual in our society not to change your last name when you get married, but sometimes people don't. I have a friend whose wife didn't change her name after the wedding because of the hassle of all the government documents that need changed.

Come to think of it..."Trisha Brooks" does sound a lot different than "Trisha Yearwood".