Donny Osmond apologized to Larry King Monday, days after he had threatened to block the broadcast of a CNN interview in which King asked his sister Marie about placing her son in rehab for substance abuse. Appearing on NBC's Today show, Donny acknowledged that he was upset about the question but said that he later learned that the news had already been leaked to the tabloids and that King's question had allowed Marie to address the matter before it appeared in print. "I have to apologize to Larry King because I said some things against him," he told Meredith Vieira during the interview. "In hindsight, I'm grateful that he gave Marie that platform."