Darius Rucker celebrates his 48th birthday today, or as his son would say, he’s turning Jimmie Johnson!

The “Wagon Wheel” singer took to Twitter to share his son Jack’s clever way to remember his dad’s age.

Die-hard NASCAR fans know exactly would little Jack means, as Jimmie Johnson is the driver of the No. 48 Lowe’s car.

Jimmie himself responded to the tweet, saying “I like your number today @dariusrucker.” He added “Jack is the man!”

Darius will take the stage Friday night to sing the “National Anthem” before the NASCAR Sprint Cup Series race at Charlotte Motor Speedway.