Quite The Shake Up on NBC...

"The Tonight Show" may be undergoing another host change, with a familiar face back in the fold. TMZ.com quotes sources who say Jay Leno will host "The Tonight Show" for a full hour, now that Conan O'Brien has rejected the network's offer for him to follow Leno on the late night circuit. According to TMZ, NBC executives still have to put the finishing touches on the new deal, but say NBC would sign off on the plan if O'Brien left the network. In a scathing statement issued on Tuesday, O'Brien said he would not participate in what he called the "destruction" of "The Tonight Show" by accepting NBC's offer to move his show to midnight so that Leno could return to his old 11:30 pm time slot.