The morning host on New York City's Top-40 "92.3 Now" WXRK-FM made it official this morning, telling listeners that he and his wife, singing star Mariah Carey, are expecting twins. Rumors of the pregnancy, and then whether there would be more than one baby, have been fodder for the tabloids. Cannon said his listeners weren't the first to know the news. During a performance of the annual Christmas Tree lighting at the White House last week, Carey told President Obama and First Lady Michelle Obama. She is expected to give birth sometime in March.