Luke Bryan, Wife Caroline Expecting Baby No. 2!

Congratulations to Luke Bryan and his wife, Caroline, on their big announcement today: their son Bo is going to be a big brother! Luke and Caroline are expecting their second child in August.

"We're excited to have another little member of the family coming in," Luke tells PEOPLE magazine. "When you successfully brought one in the world, you are a little more confident in your ability to do it the second time. We're a little more relaxed."

Bo turns two years old in March. His mom and dad plan to find out ahead of time if he's having a little brother or sister. "I'd lose too much sleep wondering otherwise!" Luke says of finding out the baby's gender as soon as they can.

In the meantime, they're teaching Bo to be gentle with his sibling. "When he wants to play around and jump on Caroline we're like, 'You have to be careful. Mama has a baby.' And he'll put his finger on her belly and point and say, 'Baby,' " the proud dad reports.