Kate Middleton and her family took a ski vacation in the Alps sometime between Christmas at Sandringham and her 43rd birthday on Jan. 9, which she is thought to have celebrated at home.

In another sign of the progress she's making in her recovery following her cancer treatment, Kate Middleton apparently felt well enough after the holidays for one of her longtime favorite activities: Skiing.

After getting through the “toughest year of [her] life,” Kate Middleton spent a “chaotic” Sandringham Christmas celebrating while surrounded by 44 members of the royal family. While Kate’s holiday schedule was packed with longtime traditions,