George W. Bush is going to be a grandfather.

The former president's daughter Jenna announced Wednesday she was "nervous and so excited" to be expecting her first child, due sometime in the spring of 2013.

"I'm a first-time mom, but it's something I've always wanted. I'm a teacher and I love kids," Jenna Bush Hager, 31, said on NBC's "Today Show," where she serves as a contributor.

She appeared on the show with her husband Henry Hager, whom she married in 2008 on her family's 1,600-acre ranch in Crawford, Texas. Hager said his wife would "instill wonderful values" on their new baby.

The former president, who phoned into the show along with his wife Laura, declared he was "fired up" about becoming a grandfather -- but that he wasn't planning on changing any diapers in the near future.

"I'll be the guy in the Ford 250 driving around the ranch with the grandchild," George W. Bush said.

Laura Bush said she was "thrilled for Jenna and Henry and, of course, for George and me to have the grandchildren we've been really looking forward to."

In the months before Jenna's wedding four years ago, the first lady joked about potential names for their first grandchild

"George or Georgia ... Georgina. Georgette," she speculated.

And what will the new addition to the Bush clan call the former leader of the free world?

"Sir," the former president joked.