While we're used to celebrating the Queen's birthday in June here in NZ, her actual birthday is in fact on April 21 - which this year happens to fall of Easter Sunday.
It's pretty common for the Monarch to have two birthdays, especially if their actual birthday doesn't lie during the British summer months. This is so the birthday can be celebrated in better weather for the official Birthday Parade, also known as Trooping the Colour.
This year the Queen will celebrate her 93rd birthday on Easter Sunday, meaning she's likely to attend a church service at St George's Chapel in Windsor. Many of the royal family commonly attend the service with the Queen, but it's said to be unlikely that Prince Harry and Meghan will be in attendance this year as the Duchess is due to give birth very soon.
The same was thought about Kate Middleton last year, however, but she made a surprise appearance at the service while heavily pregnant with Prince Louis - he was born three weeks following.
Not only will the family be celebrating the Queen's birthday this Easter, but also Prince William and Kate's eight wedding anniversary on Easter Monday, and Prince Louis' first birthday the day after!