Credit: Neilson Barnard/Getty

Welcome to the boys club, Colt Daniel.

Country music superstar John Rich, 37, and his wife Joan, 41, welcomed their second son on September 29, Rich announced via Twitter.

Weighing 7 pounds, 14 ounces, a "very proud" Rich said Colt is a "real 'Son of a Gun!'"

Rich, who tied the knot on December 6, 2008, has one other son, Cash, 20 months. In May, the "Country Done Come to Town" singer won Celebrity Apprentice and received $250,000 on behalf of St. Jude Children's Research Hospital.