Country music star Vince Gill is set to become a first-time grandfather. The singer's daughter, Jenny Gill, and her husband Josh Van Valkenburg have announced they are expecting their first child. Jenny, who is also a singer like her famous father, took to Facebook.com to announce the good news, revealing she is due this August (14). She is the only child of Vince and his first wife, Janis Oliver. Vince, 56, also has a 13-year-old daughter with his wife of 14 years, singer Amy Grant.