Brad Paisley turned the big 4-0 Sunday, and he got a special birthday video from  The Grand Ole Opry. Of course, knowing that Brad is a big prankster, it only makes sense that it would be a funny birthday message. 

In the video, we see the back of a Marilyn Monroe look alike singing "Happy Birthday Mr. Paisley". But, the shocker comes at the end of the song when we get a close up of "Marilyn." It's Little Jimmy Dickens dressed as Marilyn! Paisley tweeted "a clear case AGAINST HD cameras."

Check out the video below!