The duchess is set to celebrate the milestone at home with the Duke of Edinburgh on Monday at her Bagshot Park home.

The Duchess of Edinburgh is marking her 60th birthday privately at home with the Duke of Edinburgh, and a new photograph has been released to mark the milestone

The picture was taken at Bagshot Park this month by photographer Christina Ebenezer, who was recommended by the duchess for her "creative style" of work.

A new portrait of the Duchess of Edinburgh has been released to celebrate her 60th birthday. In the picture, taken by London-based fashion photographer Christina Ebenezer earlier this month, Sophie looks relaxed and happy as she perches in a window seat at her Surrey home.

Duchess Sophie marked her 60th birthday on Monday, Jan. 20, and along with some gorgeous new photos released for the occasion, Prince Edward's wife is allegedly planning a special black-tie party with the Princess of Wales and other royal guests.

Kate Middleton found a mentor in Sophie, the Duchess of Edinburgh when she was first welcomed into the royal fold, but their warm working relationship has developed into an even closer sisterly bond amid Kate’s cancer battle.

Duchess Sophie turned 60 on Jan. 20, and the Royal Family released a new portrait in honor of the momentous occasion. London-based fashion photographer Christina Ebenezer created Duchess Sophie's beautiful new portrait.