Duchess of Cambridge Kate Middleton is expecting her baby in July, St. James' Palace announced Monday morning. 

''Their Royal Highnesses The Duke and Duchess of Cambridge are delighted to confirm they are expecting a baby in July," the palace said in a statement. "The Duchess's condition continues to improve since her stay in hospital last month.''

If the baby is born July 1, he or she will share a birthday with Prince William's mother, the late Princess Diana. The statement by the palace hinted that the duchess, 31, is not expecting twins, though rumors surfaced stating otherwise, and that she is no longer experiences severe morning sickness (hypermesis gravidarum), which she was hospitalized for in December. She is 13 to 14 weeks along in her pregnancy, ABC News stated.

Prince Charles expressed his delight about being a grandfather, saying, it's ''a very nice thought of grandfatherhood at my old age, if I may say so. So that's splendid. And I'm very glad my daughter-in-law is getting better, thank goodness.'' 

The palace announced Middleton's pregnancy on Dec. 3. The child, whether boy or girl, could be monarch one day since he or she is the first-born to Prince William, 30, who is second to the throne after his father Prince Charles. The child will be behind Prince William in the line of succession.

Middleton and Prince William, 30, married in April 2011 in a lavish affair that was attended by celebrities, royals and watched on television by viewers all over the world.

Britain's National Portrait Gallery unveiled the first official painting of Middleton in a public ceremony in London on Jan. 11. The portrait was created by Paul Emsley, who said about Middleton "She struck me as enormously open and generous and a very warm person."

Middleton has kept out of the spotlight since announcing her pregnancy and the palace said she spent her 31st birthday on Jan. 9, "privately," reportedly with her husband at their home in north Wales.

Tags: Kate Middleton Prince William