There's been a major shake-up in late-night, folks. Conan O'Brien, who's been hosting NBC's Late Night since '93, has inked a new deal with the network that calls for him to replace Jay Leno as host of the Tonight Show in five years. "In 2009, I'll be 59 years old and will have had this dream job for 17 years," says Leno. "When I signed my new contract, I felt that the timing was right to plan for my successor and there is no one more qualified than Conan." Appropriately enough, the bombshell comes the same day the Tonight Show celebrates its 50th anniversary on the air. In other succession news, NBC is expected to announce that Kate Couric's 13-year-old daughter, Ellie, will replace her mama on the Today show in 2031.