The Thompsons are officially cubed.

Keifer and Shawna Thompson of Thompson Square have welcomed a son to the family. Rigney Cooper Scott was born Sunday at 3:46 AM and weighed in at 7 pounds, 13 oz with dark blue eyes and brown hair.

The husband and wife duo took to Instagram to share the baby bulletin.

“We’re so excited to be able share this monumental day with all of you,” Shawna and Keifer captioned a photo of the three. “We’ve had many wonderful things happen to us but this absolutely tops them all. We want to thank you all for being there for us and our music and for all of your support during our pregnancy. We can’t wait to see you out on the road this year but until then please say hello and welcome to this big ol world, Rigney Cooper Thompson aka

While Thompson Square reveals “Rigney” is Shawn’s grandmother’s maiden name, they plan to call their son by his middle name “Cooper.”

Baby Thompson is the first child for the “Trans Am” singers, who wed May 1999.