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Now that's a headline worth talking about!

CNN's Piers Morgan and his wife of one year, Celia Walden, are expecting their first child together, the newsman announced on Twitter Sunday.

"It's the best news ever," a source close to the couple tells Us Weekly 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.