October 10, 2012 11:00 AM

Courtesy Tide

Beverly Hills will forever hold a special place in Nick and Vanessa Lachey‘s hearts.

The new parents owe it to a particular street in L.A.’s posh city for helping them come up with a name for their now 4-week-old son, Camden John.

“It’s kind of a funny story. I’ve always liked the name Colin. We thought that Colin would be the name. And John is my dad’s name,” Nick, 38, told PEOPLE on Tuesday.

“But as we got further into it, I learned that Vanessa wasn’t a big fan of the name Colin, so we started looking for another ‘C’ name.”

Nick, who frequented Vanessa’s obstetrician’s office with her on Camden Drive, one day suggested, “Hey, what about Camden?”

At this point, he says, “We didn’t really know anyone else named Camden. It was such a neat name. We fell in love with it and decided on it five or six months ago.”

And just in case there was ever any confusion, the 98 Degrees frontman wants everyone to know — with a laugh, of course — “He’s not named after the city in New Jersey.”

Falling in love with his baby boy has been as easy as falling in love with the name.

“As a first time parent, you don’t know what to expect,” Nick explains. “You get all that advice, but we’ve been blown away and happy about the fact that he’s just been a good baby. He’s got a great temperament. Every day is fun. It’s a new adventure and we’re loving every second of it.”

Nick even appreciates the typically less-desired parts of parenthood.

“Diapers are no problem!” he says. “I had a little training with the niece and nephew with diaper duty, and yeah, I’ve got no problem changing diapers. It makes for good bonding moments with me and the little guy.”

Lachey — who recently teamed up with Tide for their Show Us Your Colors football campaign — posed for a photo with Camden in matching Cincinnati Bengals gear.

“I’m an avid, passionate, lifelong Bengals fan, so this was kind of a no-brainer for me,” Nick says. “Having a new son and being able to pass on my passion for my hometown team to him is great. I’m glad I have a son because in the middle of a great sports season, I can share those big moments with him. If I had a daughter, she’d probably be doing the same thing, but she’d probably resent me a little more for it.”

Through Tide’s photo sweepstakes, football fans can share photos documenting a time they were most proud to wear their team’s colors, the way Nick and Camden took their special picture. Photos can be uploaded through Nov. 30 for a chance to win an all expense-paid trip for two to Super Bowl XLVII in New Orleans.

— Dahvi Shira

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