Lilibet Diana Mountbatten-Windsor is a year old! Prince Harry and Duchess Meghan's daughter turned 1 on Saturday, and this is how the Royal Family celebrated her birthday.Lilibet Diana celebrated her first birthdayThe Royal Family shared lots of birthday messagesHere are the tributes for Prince Harry and Meghan's daughterOn June 4, Lilibet Diana celebrated her first birthday. The daughter of Prince Harry and Duchess Meghan reached a real milestone. Of course, the royals also publicly congratulated their family member.Big first birthday for Lilibet DianaOn her Twitter page, Queen Elizabeth II wrote to Lili: "Wishing Lilibet a very Happy 1st Birthday!"Prince William and Duchess Kate paid tribute to their niece on social media: "Wishing a very happy birthday to Lilibet, turning one today!" Prince Charles and Duchess Camilla were also sure to wish Lilibet well.Also interesting:Many fans were hoping for a new photo of the little one on her big day. Meghan and Harry, however, prefer to keep their children out of the public eye.So far, the kids have visited the UK undetected. But the Queen is said to have met her great-granddaughter just before her birthday, the Daily Mail reported.Besides her throne anniversary, the Queen thus had another reason to celebrate. Watch the video above for the full story!