Months after Derek Hough announced the harrowing news that his wife, Hayley Erbert, had undergone emergency brain surgery, the ‘Dancing with the Stars’ luminary has shared an uplifting update, bringing joy and hope to their myriad fans. The update comes after months of health struggles for Erbert. In a poignant black and white photograph posted on Instagram, the Derek Hough and Hayley Ebert are captured from behind, their arms wrapped around each other in a comforting embrace, with Erbert resting her head on her husband’s shoulder. Hough’s accompanying caption, “Stepping onto this blank canvas…