The royal couple has been married for seven years now and counting.
Paula Laughton, head model maker at Legoland said: "We had lots of fun building the new scene to raise our very own tiny toast to the new royal arrival". However, this past weekend was all about celebrating those who came before.
"The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles", Kensington Palace said in a statement. The auto is adorned with balloons, streamers and a license plate reading "JU5T Wednesday", with the number five cleverly taking the place of an "S".
"Seven years ago today - thank you for all the lovely messages on The Duke and Duchess of Cambridge's wedding anniversary", reads the accompanying caption.
Prince Charles is "so pleased" to have become a grandfather for the third time after his son Prince William welcomed a son into the world this week. In 2010, Prince William popped the question with a stunning sapphire and diamond engagement ring that once belonged to his mother, the late Princess Diana.
The royal couple kept the public waiting for four days before revealing the name of the little royal. And the way they tell stories is such an effortless thing.
Parenthood, the friend adds, "suits them really well".
"Kate's anxious that Charlotte will feel it the hardest as the youngest, but she's such a confident little girl and growing up so fast, Kate is hoping she will adjust", a source confirmed.
It will be interesting to see what the future holds for Prince Louis and his siblings.
The princess was pictured collecting posies, peering out of the windows of their plane with brother George - but also having a little tantrum on the tarmac. From there Kensington Palace tweeted out the news and an easel with all the birth details was placed outside of Buckingham Palace before the end of the day.