"We're so excited," Bush Hager, 31, tells PEOPLE in an exclusive interview. "We can't wait."
Neither can her proud parents. It will be the first grandchild for former President George W. Bush and former First Lady Laura Bush.
"We're both really thrilled," Laura Bush tells PEOPLE. "We've been looking forward to being grandparents for a long time and we're very excited about it," she says.
The former President called in to Today Wednesday for his daughter's announcement.
"I'm fired up. I'm looking forward to it," he shares. "I could barely contain the news."