The event marked the first time the duchesses have been pictured together since Christmas Day.
However, while the palaces gave no explanation as to why they had issued the guidance now, there has been rising abuse of Kate, the Duchess of Cambridge, and Meghan, the Duchess of Sussex, since the former USA actress married Harry last May.
"Much of social media has become a sewer", she said on Twitter last month.
French 'voices of Isis' killed in strikes on Syria
Still, he warned that the reprieve would not last long. "The last ISIS holdout is tiny patch in Baghouz, northern Syria". Despite this setback, the SDF has made progress and has been pushing further into the town.
Pakistan arrests Jaish-e-Mohammed chief Masood Azhar's son, brother
Ministry of Interior Secretary Azam Suleman Khan said Hammad Azhar and Mufti Abdur Rauf were among those arrested on Tuesday. Replying to a question, the minister said that Pakistan was acting against the banned groups in its own interest.
Indonesia and Australia Ink Free Trade Agreement
Australian working holiday visas for young Indonesians will be increased to 6,000 a year from the current 1,000 over six years. Mr Simonaitis said AEGIC had been laying the groundwork to boost the value of Australian feed grains into Indonesia.
Rumours of a royal rift between the pair began swirling after news emerged that Meghan and Harry will move away from Kensington Palace to make their family home 25 miles away in Windsor.
"Prince Charles was created The Prince of Wales aged 9 on July 26th 1958", Clarence House tweeted.
The Duke and Duchess of Sussex, the Duke and Duchess of Cambridge and the Duchess of Cornwall, along with Prime Minister Theresa May, were among the guests at Buckingham Palace. On the other hand, Prince Harry and Markle were positioned at the back.
Britain's Catherine, Duchess of Cambridge is seen at a reception to mark the fiftieth anniversary of the investiture of the Prince of Wales at Buckingham Palace in London, Britain March 5, 2019.
Meghan cut a graceful figure in a recycled £895 Amanda Wakeley coat teamed with a floral embellished dress as she stood alongside Harry during the celebrations on Tuesday, joined by Kate and Prince William, 36.