Pop superstar Christina Aguilera revealed during an appearance on "Live with Regis and Kelly" Tuesday that she is currently working on what will be her fifth studio album, even though her work on the new singing competition show "The Voice" keeps her quite busy.  ""I'm diving in right now as I'm shooting the show," she said. "I have so much great material this time around, coming from the crazy year I've had, and experiencing ['Burlesque'] and experiencing so much on different levels."