Thomas Rhett

Just in time for Father's Day, the musical father-son pair are joining forces for a sweet duet.

Rhett's three daughters have since come around to the idea of a baby sister -- but maybe they'll still get a baby brother one day.

Way to go, Willa Gray!

"I had that idea in my phone for so long and had no idea how to write it ..."

"[I'm] still kind of just doing life and wondering what he's doing, because it's probably way cooler than anything that we're doing down here ..."

Thomas Rhett shared the news onstage in Texas ... and he also shared the sex of the new baby.

"I've thought about all the ways I would approach that situation: Am I going to be a super-stern dad? Am I going to be the dad that invites him in for coffee? What kind of conversation is that gonna be like?"

Instead of songwriting and worrying about his career, Rhett leaned in to what the pandemic was forcing nearly everyone to do: slow down.

"I got emotional just watching her get emotional."

Apparently, Dierks Bentley was offering up some light-hearted heckling in the direction of his ACM Male Artist of the Year competitors.