November 26, 2014 01:00 PM

Things in the Lachey household are starting to get hectic.

With Nick and wife Vanessa‘s daughter due just after the holidays, the singer is counting down the days until they are officially a family of four.

“I’m very excited to be a dad again,” Nick, 41, tells PEOPLE. “My dream in life has always been to have a family. It’s surreal when it starts to happen before your eyes.”

With weeks to go until her arrival, the couple aren’t quite ready for baby girl’s birth just yet. “It’s all those logistical things — the nursery, the hospital stuff,” says Nick of their long to-do list.

Courtesy Nick Lachey

But their biggest feat is preparing their firstborn, 2-year-old son Camden John, for the family’s new addition. “We’re getting Camden as ready as he can be so it’s not a total shock in his life,” Nick explains.

Although the toddler is showing interest — Camden “kisses [Vanessa’s] belly all the time and tells her he loves her,” the singer says — the couple realize he’ll still need time to adjust.

“Until she’s here and stealing his attention, that’s when the true reaction will happen,” admits Nick.

Fortunately, they’re not worried — Camden is “a sweetheart of a kid” and seems to have skipped the terrible twos.

“He’s very, very smart. He’s a lover. He’s a total boy. He’s into cars and balls and trucks,” says the proud papa. “He’s certainly discovering his voice and he’s not shy about letting us know when he’s not happy about something. But he’s far from a tyrant.”

The couple’s biggest challenge with two babies may be trying to find quiet time together. But despite the struggle, the VH1 Big Morning Buzz Live host and his actress wife are convinced keeping the romance alive is “always the key” in a relationship.

“You got to carve out time for each other. Life gets crazy and hectic and you can forget about each other,” shares Nick.

“It’s not like we go clubbing anymore. It’s pretty much dinner and a movie sometimes. As long as we’re spending time together, that’s the main thing.”

One thing that’s not going to take a backseat though is Nick’s career. He recently released his album, Soundtrack of My Life, and just took part in a new digital project called DreamJobbing, an online platform that allows everyday people to try out for their fantasy job.

As for his dream job, Nick laughs, “I always wanted to be the head trainer for the Bengals football team. But it’s such a good thing that I didn’t end up doing it because I was awful.”

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