Kimberly Williams and Brad Paisley at Sony/BMG Grammy After Party held at the Beverly Hills Hotel. Beverly Hills, California - USA - 10.02.08

The couple explains Jasper is a name they both really like and Warren is the name of Celebrity singer Paisley's grandfather, who bought the star his first guitar.

The tot was born in Nashville, Tennessee on Friday (17Apr09).

The couple already has a two-year-old son, called William Huckleberry.

Paisley will spend much of this week playing the doting new dad before headlining the Stagecoach festival in California on Saturday (25Apr09).

Source: WENN