Sophie, the Duchess of Edinburgh is marking a milestone birthday! She turned 60 on Monday, Jan. 20, and friends and former colleagues have been honoring her contribution to the royal family – amid the release of the duchess' stunning new portrait.

Sophie, the Duchess of Edinburgh is turning 60 in style. The royal—who marked her milestone birthday on Monday, January 20—released a trio of stunning portraits to commemorate the special occasion over the weekend that seemingly included a subtle sartorial nod to her grand new title.

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."

On the cusp of turning 60, the Duchess opens up about the Queen’s legacy, her evolving public persona, and moments of normalcy she cherishes

In a series of candid photographs by Christina Ebenezer, the Duchess of Edinburgh chose a wardrobe of re-wears that hint at her new era of royal life

Sophie looks happy and relaxed in the Palace-released image, captured by London-based portrait, fashion and commercial photographer Christina Ebenezer at Bagshot Park this month

I love how she is not afraid to try new things and she makes beautiful choices,” designer Suzannah Crabb of royal favorite Suzannah London tells PEOPLE