Country music star Dierks Bentley announced via Twitter last week he and his wife, Cassidy, are expecting their third child later this year. On his Twitter account, Bentley wrote, "So my wife and I will be changing our family defensive strategy come the fall. Switching from Man-to-Man to Zone. #3!" Bentley also went on to ask fellow country star Tim McGraw, who is also the father of three, for advice. Bentley and his wife, who have been married since 2005, have two daughters, ages four and two.