There’s going to be another new kid on the block: Joey McIntyre tells PEOPLE that his wife Barrett is expecting their second child – a boy – in December.

“I still can’t get over it,” says the singer, 36, who also has 20-month-old son Griffin. “We feel so blessed.”

So far baby no. 2 has already managed to throw his parents for a loop. “My wife actually took the [pregnancy] test but she thought it was negative,” says McIntyre. “She came out and gave me this look like, ‘No.’ Then she showed me the test and I said ‘It’s positive! What the hell?’”

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Then when the proud parents, who were convinced they were having a girl, found out they were adding another boy to the brood. “We were shocked,” says McIntyre, who had his daughter’s name picked out. But they’re hardly disappointed. “It’s going to be a trip to have a couple of boys around.”

Griffin is more than ready for his new brother, says McIntyre, who grew up the youngest of nine kids. Along with constantly kissing his mommy’s belly, “We say to him all the time, ‘Do you want us to bring home a baby?’” Griffin’s response? “Please!”

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