Kate Middleton has previously called the young princess "Lottie."
The Duke and Duchess of Cambridge looked lovely at Tuesday's event.
The Duchess of Cambridge chose a dress by one of her favorite designers.
The 1-year-old royal had a blast with his siblings and parents, the Duke and Duchess of Cambridge.
The Duke and Duchess of Cambridge and the Duke and Duchess of Sussex all consulted on the free 24-hour service.
Oh brother, it's another joke about hair.
It's time to welcome Prince Harry and Meghan Markle to "the sleep deprivation society that is parenting."
Proud mum Duchess Kate took the pictures at the family's home in Norfolk and at Kensington Palace.
The Duke of Cambridge had a cheeky response ready.
In honor of the Prince William and the former Kate Middleton's eighth wedding anniversary, we've rounded up their standout style moments.
The Duke of Cambridge talked about "loss in my own life" during his address at a Christchurch, New Zealand, mosque targeted in March's terror attack.
Happy birthday to the son of the Duke and Duchess of Cambridge!
Kensington Palace shared the shots just ahead of the little one's first birthday.
Prince Harry and Prince William are adding fuel to the rumors of a growing rift between them.
There are also reports the Duke of Sussex and Meghan Markle would move to Africa.
"It’s a much sexier story to have two duchesses at war," Nick Bullen said.
They enjoyed pints of Guinness and the duchess handed out shamrocks.
Fatherhood can be daunting, he said at an event for a male mental health charity.
To be fair, Harry sometimes missed celebrations while single.
The Duchess of Cambridge turns 37 on Wednesday.