Scroll through the gallery below to see photos from her outing!
This is hardly the first time the 49-year-old wore this stunning frock — she previously donned it in 2019 but brought it back out for her recent solo outing.
During her trip, she spoke to management about how they had significantly less visitors in 2020 due to the ongoing pandemic.
The organization started streaming performances in October 2020, gaining new audience members. Even when life gets back to normal, the theater will hopefully continue to live stream their shows.
During her time at the theater, the royal attended a rehearsal for a new production called The Hours, which is about one day in the lives of three women.
The Queen also spoke with the director and actors about how their lives have been turned upside down in the past year.
A few weeks ago, the Queen took a trip to the Valentine School and Huntsman Holland BV — a coronavirus research center — in Rotterdamn, Netherlands.
The Queen and her husband, King Willem-Alexander, have been taking the virus seriously. So much so, they are encouraging others to get vaccinated when possible.
The couple called the vaccine "a turning point that gives hope for a way out of this crisis."
“Many thanks to everyone who cooperates! Now it is important to stick together,” they added at the time about the shot.
Following the death of Prince Philip, the pair sent Queen Elizabeth their well-wishes.
“It is with great respect that we remember His Royal Highness Prince Philip," they said. "Throughout his long life, he committed himself with dedication to the British people and to his many duties and responsibilities. His lively personality never ceased to leave an unforgettable impression. Our deepest and most heartfelt sympathy goes out to Her Majesty Queen Elizabeth and all the members of the Royal Family.”