Although both Princess Charlotte and Prince George still call their dear Grandma, "Gan-Gan", the tiny royals will eventually have to bow to her when they see her.
Now that Prince George has turned five, he is expected to bow to his grandmother.
"Certainly by age five. The only person they will curtsy or bow to is the sovereign. A royal highness does not curtsy to another royal highness," historian Marlene Eilers Koenig told Hello!.
Upon seeing the Queen, the Royal family are expected to bow twice, once when she arrives and the another when she leaves.
Speaking of George's fifth birthday, an insider close to the family tells People that George is "very independent now and not as interested in playing with Charlotte all the time."
They are close," the source insisted, "but George likes to go off and do this own thing."
Duchess Catherine has also expressed how fast little Charlotte is growing up.
"Charlotte is growing up really fast," she said.
"She is the one in charge."
We're not sure about you, but the idea of the little royals bowing to the Queen is pretty adorable!