As a source told VF, the Duchess of Edinburgh, a new family favorite, "prefers to keep the attention on her causes and charities rather than on herself."

Along with The King and Queen Camilla, Prince William and Princess Kate, who share a close bond with the Edinburghs, are said to be joining the festivities. The Princess of Wales and Duchess of Edinburgh are said to have a particularly strong relationship, with Kate viewing Sophie as a sort of "royal sister."

Sophie, Duchess of Edinburgh turns the milestone age of 60 on Jan. 20. Here, fashion insiders, including designers of some of the royal's favorite brands, reveal the secrets of her style evolution.

Congratulations are in order as Duchess Sophie gears up to celebrate her 60th birthday on Monday 20 January. In a slight deviation from tradition, the Royal Family has already marked the special day, taking to Instagram today to share a new photos showing the Duchess looking relaxed and happy ahead of the celebrations.

Skynews.com.au Digital Reporter Reilly Sullivan has discussed Sophie, Duchess of Edinburgh, celebrating her 60th birthday.

Sophie, the Duchess of Edinburgh, rang in her 60th birthday by posing for an official portrait in a white Proenza Schouler coat paired with a brown turtleneck and wide-leg bright green pants. The elegant yet modern look paired with a bold splash of color–a welcome departure from the conservative power suits she wore in her early royal days–showed just how far Duchess Sophie’s style has come over the years.