It's the Queen's official 92nd birthday on Saturday, when she will publicly celebrate being another year older.
She did in fact turn 92 back in April though. That's because the Queen has two birthdays each year.
One - her real one - on 21 April, as she was born on 21 April 1926.
Then a second one - the public celebration - on the second Saturday of June.
So why two birthdays for the Queen and how does she celebrate them?
In the past, official celebrations to mark a King or Queen's birthday in the UK have been held on a day that isn't their actual birthday.
The double birthday tradition was started more than 250 years ago by King George II in 1748.
He was born in November, which is not known in the UK for its good weather.
But King George wanted it to be possible to have a big public celebration - and November wasn't the time do it.
So, given that his actually birthday wouldn't be a good time of year for a birthday parade, he decided to combine it with an annual military parade in the summer, when the weather would hopefully be nice.
And so this is where the tradition of an official, public summer birthday for the monarch began!
The Queen usually spends her actual birthday with her family, although there will be special gun salutes in London at midday to mark it.
There will be a 41-gun salute in Hyde Park, a 21-gun salute in Windsor Great Park and a 62-gun salute at the Tower of London.
For her 'official' birthday' in June, the day is marked publicly with a big parade in London called Trooping the Colour.
Trooping the Colour has marked the official birthday of the British monarch for over 260 years.
Over 1400 soldiers, 200 horses and 400 musicians take part in the event, so it's quite a spectacle!
Lots of members of the public waving flags and wearing Union Jacks will fill the Mall outside Buckingham Palace to watch it.
On the day, a big parade will start at the Queen's official residence - Buckingham Palace - before moving along the Mall to Horse Guards Parade at Whitehall, near to Downing Street, and then back again.
Those watching from the Mall will also hope to catch a glimpse of the royal family as they travel down the Mall as part of the ceremony, and then when they gather on Buckingham Palace's balcony to greet well-wishers and watch RAF planes perform an aerial display for the occasion.
This year will be the first time that newly-weds Prince Harry and Meghan Markle will be on the balcony together, as husband and wife.
Trooping the Colour takes place on 9 June 2018