EXCLUSIVE: Inside Nick Carter and Wife Lauren's 'Game of Thrones'-Themed Baby Shower

Winter is coming.... any day now!

Winter is coming... any day now!

Nick Carter and wife Lauren are expecting their first child together, and in anticipation of their baby boy, the couple threw a Game of Thrones-themed baby shower on Wednesday, featuring a very Daenerys Targaryen-style fashion for Lauren, fur-like decor, and sweet treats inspired by the popular HBO series.

EXCLUSIVE: Nick Carter and Wife Lauren Reveal Pregnancy Complications, Cravings and Stunning Maternity Pics!

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A source tells ET, "Nick and Lauren were very happy, hugging and kissing throughout the day," noting that around 60 guests were in attendance, including the singer's fellow Backstreet Boys, Kevin Richardson and A.J. McLean. Nick's brother, Aaron Carter, was not on hand.

"Nick also spent a lot of the day in the kitchen hanging with the boys," the source adds.

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The baby boy is due to arrive on April 12 and so far Nick and Lauren have remained tight-lipped on the name, telling ET earlier this month, "It's a very strong name."

The happy couple did share their maternity pics with us earlier this month, which Nick candidly admitted was an emotional experience.

WATCH: Nick Carter Gets Emotional Over Wife's Pregnancy, Learns Sex of the Baby on DWTS

"I hate getting emotional but seeing her like that triggered this influx of emotions that really made me realize what's happening in our life," Nick said. "Without each other, the two of us would never have gotten to this point, so it feels amazing and it's crazy how much more in love you can become when you start this phase of your life."

Watch the video below.