Prince William and his wife, Duchess of Cambridge Kate Middleton, will be welcoming their third child in April 2018.
Kensington Palace made the announcement on Twitter Tuesday.
The royal couple, who are already parents to 4-year-old Prince George and 2-year-old Princess Charlotte, revealed they were expecting for the third time on September 4.
“Their royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their third child,” Kensington Palace said in a statement at the time. “The Queen and members of both families are delighted with the news.”