Kate Middleton and Prince William congratulated Prince Harry and Meghan on their new baby.

Lilibet 'Lili' Diana Mountbatten-Windsor was born on June 4 in Santa Barbara, CA.

The Queen, Prince of Wales, and Duchess of Cornwall are also delighted with the news.

Lili's first name honors the Queen and her middle name honors the Princess of Wales.

The couple announced the birth officially.

Lili was delivered at Santa Barbara Cottage Hospital.

The Cambridges shared their excitement and best wishes for the family.

The announcement was made on social media.

Meghan and Harry's trusted medical team delivered Lili.