Getty Images: Scott Gries NEW YORK -- Meredith Vieira said Monday that she will leave NBC's "Today" show next month to spend more time with her family, and Ann Curry will replace her as host. The turnover at television's top-rated morning show was anticipated. Vieira replaced Katie Couric five years ago, and has talked about wanting more free time. Vieira, 57, has three children and her husband, author Richard M. Cohen, wrote a best-selling book about coping with multiple sclerosis and colon cancer. "Even as I say this and I know that it's the right thing, I'm really sad," she said, fighting back emotion as she made the announcement on the air Monday. Her co-host, Matt Lauer, said that Vieira "has brought class and dignity and talent and a joy of life to this show for the last five years." Transitions are unusual for "Today," as Vieira was still the newbie among the show's core four that included Lauer, Curry an...