Dempsey, 59, shared a rare photo of his twin sons Darby and Sullivan, who recently celebrated their 18th birthdays and graduated from high school.

Patrick Dempsey and his wife, Jillian Dempsey, celebrated their twin sons Darby and Sullivan's high school graduation May 30. See photos from their big day!

Patrick Dempsey posts rare photo of twin sons at graduation: ‘So proud of you boys' Dempsey attended the ceremony with his wife, Jillian Dempsey, and their daughter Talula.

Patrick Dempsey is the proudest papa in the world as his twin sons make a momentous big step in their futures: high school graduation! And in the rare photo, we see which twin looks like which ...

Patrick Dempsey shares a rare photo of his twin sons' high school graduation, revealing their striking resemblance to their parents.

Patrick Dempsey will play a hitman in the new Fox series "Memory of a Killer," the network announced on Monday.

Patrick Dempsey to Topline ‘Memory of a Killer’ Drama at Fox The show will mark the former ‘Grey’s Anatomy’ star’s return to network TV.