Cam's first Christmas!

Vanessa and Nick Lachey** celebrated Christmas this year for the first time as parents. The couple, who welcomed their son Camden in September, made sure to make the holiday memorable.

"Merry Christmas Eve everyone! Light a fire, grab some egg nog, and spend some time with the family," Nick tweeted Monday, Dec. 24. "Looking forward to Cam's first Christmas."

For Christmas Day, mom Vanessa dressed her son up in an adorable onesie for the occassion.

"Merry Christmas! Here's to living, loving, laughing . . . and cute behinds!" Vanessa tweeted Tuesday, Dec. 25 with a photo of her son's ensemble. The snapshot was a closeup of Cam's little behind with "Baby's First Christmas" written in red.

Vanessa also shared a glimpse of baby Cam taking a nap on her chest Wednesday. "Snow storm in Cincinnati with my family," she captioned the photo. "The perfect day!"

But the holiday did come with a few mishaps.

"I feel like we have the Griswold Family Christmas Tree!" Vanessa tweeted Dec. 18. "Nick Lachey had to saw off the top and bottom, ha! But it looks damn good!"

And, like countless others worldwide, Nick did procrastinate on buying presents. "One week until Christmas and I haven't even started shopping . . . why do I do this to myself every single year?"

This article originally appeared on Usmagazine.com: Vanessa Minnillo, Nick Lachey Celebrate Son Camden's First Christmas: Pictures