Jim Bob and Michelle Duggar dropped a bombshell on the Today show this morning. The Tonitown, Ark., couple, who already have 18 children, told co-host Meredith Vieira that they're expecting their 19th child. "We are so thrilled," says 42-year-old Michelle, who is due this spring. "This never gets old. We are so grateful for each child." And Jim Bob and Michelle's oldest son Joshua's wife, Anna, is just one month away from giving birth to their daughter, Mackynzie Renee. "We have been looking forward to the arrival of my little girl and now get to celebrate for my parents. It's a wonderful thing," raves Josh. "We are looking forward to our first grandbaby and our 19th child," agrees Michelle.