The Danish Royal Family's matriarch turned 78, marking her very first birthday as a widow.
Despite losing Prince Henrik two months ago, Denmark's Queen was in high spirits as she stood proud on her castle's balcony, waving down to her people for her prolific milestone.
This is the first time in half a century that Margrethe has spent a birthday without her husband by her side.
After falling ill, Prince Henrik died on February 13.
In light of the loss - her entire clan stepped up so that the Queen would feel an abundance of love on her special day.
Prince Frederik was unable to attend the outing, but his wife Princess Mary and their brood proudly represented Margrethe's eldest child.
The crowds in Copenhagen got a chance to see Mary's kids show off their very sweet - yet very different personalities.
Prince Christian of Denmark, 12, proved to be mature beyond his years.
And it looks like it's a trait his little brother seven-year-old Prince Vincent has picked up.
While Vincent's twin, Princess Josephine is clearly the family's little comedian.
The seven-year-old had everyone in giggles, especially big sister 10-year-old Princess Isabella, with her cheeky antics - which include a royal balcony edition of the past time "peek-a-boo".
Dressed in a captivating long-sleeved red dress, our Aussie-born royal seemed overjoyed to be with her mother-in-law, sharing many sweet exchanges.
Also by Queen Margrethe's side was her youngest Prince Joachim.
He was joined by his family including second wife Princess Marie, and their two children; Prince Henrik, eight and six-year-old Princess Athena.
His kids from his first marriage to Countess Alexandra - Prince Nikolai, 18, and 15-year-old Prince Felix - were also in attendance for their Grandma's big day.