The 16-month-old reportedly started saying words a few months ago.
Eugenie has worn the Claudie Pierlot dress on several occasions in the past as well, most notably on the night before her wedding.
The royal siblings showed their playful sides while they helped in their parents' environmental efforts.
Prince William and Kate Middleton also didn't use the HRH title along with Harry's name while wishing him on his 36th birthday earlier this week.
Princess Beatrice recently returned to London after her low-key honeymoon with husband Edoardo Mapelli Mozzi in France.
Meanwhile, a report has claimed that the royals are "not happy" with Harry and Meghan's recent deal with Netflix.
The monarch recently marked the anniversary of the bombing on Buckingham Palace during the Blitz on September 13, 1940.
This will also be the first time Prince Harry will spend his birthday on Tuesday, in his and Meghan Markle's first independently-bought home.
Meghan Markle and Prince Harry delivered heartfelt speeches at the evening reception following the wedding ceremony.
Amelia and Greg, who first met when they were both studying at the University of Cape Town, have been dating since 11 years.
She recently celebrated the first anniversary of her charity clothing line as well, which helps women back into the world of work.
From Monday, the "rule of six" in England will ban more than six people meeting anywhere socially indoors or outdoors.
Archie Harrison is only 16 months old and loves to climb in front of the web cam, when his parents are busy holding meetings with their charities.
Prince Philip relocated to Wood Farm on the Sandringham estate after retiring from public duties in 2017.
The royal along with her husband Jack Brooksbank has seemingly moved back to Ivy Cottage after staying with parents at Royal Lodge.
Netflix co-CEO Reed Hastings appeared to rule out that Meghan Markle will act as well under the deal.
Princess Sofia, born Sofia Kristina Hellqvist, worked part-time as a waitress and glamour model before marrying into the Swedish royal family.
Prince Harry and Meghan Markle have a strict list of guidelines for sponsors if they want to book them for a speech.
Prince Charles had been helping the couple with some ongoing living costs when they started their new life in California with son Archie Harrison.
Her property developer husband was also accompanying her for the outing, but waited in the car while she shopped.
Princess Beatrice tied the knot with Edoardo Mapelli Mozzi on July 17 in a vintage gown by Sir Norman Hartnell.
The newspaper claimed that the Duke and Duchess of Sussex apparently pulled back from the event due to some "conflict of plans with another streaming service."