Ellen, AI's 4th Judge???

WHAT?? Ellen Degeneres as the 4th judge for American Idol? Wow. I mean, I don't watch Idol anymore but I would think the producers would choose someone with some sort of music background. Ellen's great and all but this is a music competition. I was hoping Mary J. Blige, who's going to be a guest judge would actually be the 4th one. This is just totally weird. I just hope they know what their doing.