The royal christening took place at the Royal Chapel of All Saints in Windsor, which is conveniently close to the Queen's current residence at Windsor Castle.
It marks one of the first times the Queen has attended an event after she was hospitalised in October. In subsequent weeks, the Monarch has laid low as she recovers. Last week, she also missed the annual Remembrance Day celebrations due to a "back sprain", the palace confirmed.
There's no doubt it would have been a sweet reunion between the relatives. Alongside the Queen and her two granddaughters, other royals in attendance included Zara's husband Mike Tindall and their two kids Mia, seven, and Lena, three.
Princess Eugenie's husband Jack Brooksbank was also in attendance, as well as doting new grandmother Sarah Ferguson.
It's also believed that William and Kate Middleton attended the family event.
Princess Eugenie welcomed her first baby boy back in February while the UK was still in a strict lockdown. Baby August became the Queen's ninth great-grandchild. One month later, Zara welcomed her third child, Lucas.
Meghan Markle also gave birth to her second child with Prince Harry in June this year, and while it's expected their little girl (named Lilibet Diana) will be christened, it's likely to happen at a later date in the United States where the family currently reside.