The "Today" correspondent and daughter of former President George W. Bush and former first lady Laura Bush announced on the morning program that her daughter Mila, who turns 2 this month, will be getting a little sister in August.
Hager also took to Instagram to post a sweet family photo alongside the announcement: "Feel so lucky that we're adding another precious, precocious little girl to our family. My heart is full."
For now, it seems Mila is taking the news really well.
"She's excited now, I think," Hager revealed this morning on "Today." "Baby Sissy in theory is this great thing, in her mother's tummy. When Baby Sissy comes out she may change her mind really, really fast."
Hager says her parents, of course, are excited about getting a second grandchild.
In fact, she says Mila has her grandfather wrapped around her toddler-sized finger.
She explained that the former president goes by the nickname "Jefe," which means "boss" in Spanish.
"But really what happens is that Mila just bosses Jefe around: 'Jefe, sit down, Jefe, tea!'" she told the "Today" hosts.
When anchor Tamron Hall asked Hager if she encouraged that, the 33-year-old mom gave an emphatic yes.
"Oh yeah, totally, she's precocious and bossy," she said. "I like a strong little lady."