For over a decade, CHRISTINA AGUILERA has been one of the top pop music superstars -- and now she's ready to help the next big star make it to the top! Christina is a coach on the brand new show, "The Voice," and will tell Ellen what to expect when it premieres tonight!There are few people who love reality TV more than Ellen does -- but MARY McCORMACK is one of them! She's always looking for the newest and most outrageous show to share, and she'll tell Ellen what she's found today -- along with what to expect on the brand new season of her show, "In Plain Sight."Since winning season 7 of "American Idol," DAVID COOK has been going non-stop! He's about to release his third album this summer, and will be here to perform his fantastic new single, "The Last Goodbye."