Now that's a headline worth talking about!
"It's the best news ever," a source close to the couple tells of Walden's pregnancy. U.K.'s Daily Mail reports 34-year-old Walden is about four months along.
Walden, a British columnist, walked down the aisle with the "America's Got Talent" judge last June after four years of dating.
"I know what you're all thinking: 'How lucky is she, right?'" Morgan joked on the TODAY show after popping the question to Walden in December 2009.
The new arrival will be 46-year-old Morgan's fourth child, joining his three sons from his first marriage.