Dunn's spokesperson has announced that the musician's son Jesse Dunn, a teacher, and his wife are expecting a baby, reports Country Weekly.
The 'My Maria' singer's grandson will be born in February.
Jesse is Ronnie and wife Janine Dunn's only son, but the couple also have two daughters together.
Ronnie and Janine tied the knot in 1990.
His legendary country music group Brooks and Dunn split after 20 years together in 2009. Ronnie has since scored solo hits such as 'Bleed Red' and 'Cost of Livin'.
Ronnie continues his solo tour tonight (Wednesday, November 30) in Foxborough, MA at Toby Keith's I Love This Bar and Grill at Patriot Place, before taking a break from the road until January.
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Watch Ronnie Dunn's 'Bleed Red' music video below: