 Hundreds of mostly exiled Tibetans celebrating the birthday of the Dalai Lama, the spiritual leader of Tibetan Buddhism, turning 89 on Saturday. Schoolchildren here singing during a cake cutting inside the temple in the town of Dharmshala, where the Dalai Lama has his headquarters, but the Dalai Lama wasn't there to hear it. He's in the U.S. undergoing knee replacement. Dave Packer, ABC News.