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.
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 same thing happened before Kate Middleton gave birth to Prince Louis last year.
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 Sussex and Prince William are reportedly feuding.
Kensington Palace shared the shots just ahead of the little one's first birthday.
The Duchess of Cambridge wore baby blue to church as the royal family celebrated Easter and Queen Elizabeth's 93rd birthday.
"It’s a much sexier story to have two duchesses at war," Nick Bullen said.
It only took about eight years for Queen Elizabeth II and the Duchess of Cambridge to make it happen.
They enjoyed pints of Guinness and the duchess handed out shamrocks.
The two duchesses caused a stir earlier this week.
It's their first public appearance together in about three months.
The pale pink gown is plain old perfection.
"William says hi!" the actress wrote in a funny post on Instagram.
"It's so hard," the Duchess of Cambridge said to fellow parents on Tuesday.
The Duchess of Cambridge couldn't say whether the queen likes this super-popular food.