Royal family members congratulated Meghan Markle and Prince Harry on the birth of their second child

• Meghan Markle and Prince Harry announced the birth of their second child on Sunday.
• Princess Eugenie, Prince William, and Kate Middleton, have all congratulated the couple online.
• The royal palace also said the Queen, Prince Charles, and Camilla are "delighted" by the news.

Prince Harry and Meghan Markle announced the birth of their second child, Lilibet Diana Mountbatten-Windsor, on Sunday.

Shortly after the couple shared the news with the world, members of the British royal family took to Instagram to congratulate the couple.

"Congratulations to The Duke and Duchess of Sussex on the birth of Lilibet Diana!" the royal family wrote in a joint statement on Instagram, alongside a photo of Markle and Harry that was taken on their wedding day in May 2018.

"The Queen, The Prince of Wales and The Duchess of Cornwall and The Duke and Duchess of Cambridge are delighted with the news. Lilibet is Her Majesty's 11th great-grandchild," the post continued.

The palace shared a similar statement with the press on Sunday. It read: "The Queen, The Prince of Wales and The Duchess of Cornwall, and The Duke and Duchess of Cambridge have been informed and are delighted with the news of the birth of a daughter for The Duke and Duchess of Sussex," the statement said.

Prince William and Kate Middleton also congratulated the couple via Instagram. They did not use Markle and Harry's official titles in their message.

"We are all delighted by the happy news of the arrival of baby Lili," they wrote. "Congratulations to Harry, Meghan and Archie."

Later on Sunday, Princess Eugenie - one of Harry's cousins - shared a black-and-white photo of the couple on her Instagram story.

"Congratulations dear cousins," she wrote across the photo, along with six red heart emojis. "We couldn't be happier for you all."

Lilibet Diana was born on June 4 and is named after both the Queen, whose family nickname is Lilibet, and the late Princess Diana, Harry's mother.

In a note posted to the website for their foundation, Archewell, on Sunday, the Duke and Duchess of Sussex said of their daughter: "She is more than we could have ever imagined, and we remain grateful for the love and prayers we've felt from across the globe. Thank you for your continued kindness and support during this very special time for our family."