All hail the queen! Queen Elizabeth II turns 90 on Thursday, and her birthday celebration will definitely be one for the ages.

But just because it's her special day, that’s doesn’t mean Her Majesty won’t be working. The longtime monarch will pay a visit to Windsor Castle near London on Thursday. There she will unveil a new plaque alongside her husband, Prince Philip, Duke of Edinburgh, reports USA Today. Her birthday celebrations will continue on Friday with a lunch she will be hosting for U.S. President Barack Obama and First Lady Michelle Obama.

For those looking to pay tribute to Her Majesty on her monotonous birthday, relive some of the royal’s most famous quotes below:

On Being Queen:

“Therefore I am sure that this, my Coronation, is not the symbol of a power and a splendor that are gone but a declaration of our hopes for the future, and for the years I may, by God's Grace and Mercy, be given to reign and serve you as your Queen,” Queen Elizabeth II said at her Coronation in 1953.

queen elizabeth II birthday Relive one of Queen Elizabeth II's most memorable quotes to honor her 90th birthday. Pictured: Britain's queen smiles as she arrives to open a bandstand at Alexandra Gardens in Windsor, west of London, on April 20, 2016. Photo: Getty Images

On Princess Diana:

“I share in your determination to cherish her memory,” the queen said after her former daughter-in-law's death in 1997. “I hope that tomorrow we can all, wherever we are, join in expressing our grief at Diana's loss, and gratitude for her all-too-short life. It is a chance to show to the whole world the British nation united in grief and respect. May those who died rest in peace and may we, each and every one of us, thank God for someone who made many, many people happy.” 

Watch Queen Elizabeth II's speech about Princess Diana below:

On Traveling:

“I don’t think you can stay in London all the time. You have to visit other parts of the country to either find out what’s going on or try and encourage people in different areas … I think the possibility of meeting more people is very important. A lot of people don’t come to London very often so we travel to them instead.” 

Watch Queen Elizabeth II talk about her life:

On Success:

“It has perhaps always been the case that the waging of peace is the hardest form of leadership of all. I know of no single formula for success, but over the years I have observed that some attributes of leadership are universal, and are often about finding ways of encouraging people to combine their efforts, their talents, their insights, their enthusiasm and their inspiration, to work together,” addressing the United Nations General Assembly in July 2010.

prince william, queen elizabeth, prince philip Prince William, Duke of Cambridge, Prince Phillip, Duke of Edinburgh and Queen Elizabeth II attend the Windsor Greys Statue unveiling on March 31, 2014 in Windsor, England. On Thursday, Queen Elizabeth II celebrates her 90th birthday. Photo: Getty Images

On Destiny:

“In a way I didn’t have an apprenticeship,” she said, recalling the death of her father, King George VI, in 1952 and her subsequent rise to power. “My father died much too young. It was all a very sudden kind of taking it on and making the best job you can. It’s a question of maturing into something that one’s got used to doing and accepting the fact that here you here, and it’s your fate, because I think that continuity is very important. It is a job for life.”