Jon & Kate Plus 8—the hit reality TV series on TLC about the Gosselin family, consisting of parents Jon and Kate, their fraternal twin girls and sextuplets—had an addition in a recent episode, but it's not what you're thinking.

In the Dec. 1 episode titled “It’s a Book,” Zondervan publicist Karen Campbell tagged along with the family as the show’s crew followed them to New York City for the Multiple Blessings media tour, with stops at the studios of Good Morning America and Fox & Friends as well as a taping with The 700 Club.

Multiple Blessings: Surviving to Thriving With Twins and Sextuplets—by Jon and Kate Gosselin and co-written by Beth Carson—was released by Zondervan Oct. 14. The book already has nearly 300,000 copies in print, and was in its seventh printing.

“Planning the tour was more time consuming than it seemed on the show,” said Campbell, noting that she was “too busy to stop and take pictures” with the famous family. “It’s a lot of work to make sure 10 people get to where they need to be on time. But it all went smoothly—not a single hiccup.”

Campbell was acknowledged on-camera during the episode, although she didn’t have any speaking parts. “I actually did tell one of the (Gosselin) girls that one of the books Kate signed was for my mom while I was on camera,” Campbell said. “It’s a show about the Gosselins, so I wasn’t expecting to talk on camera. I was happy there was an entire episode dedicated to Multiple Blessings. ”

Campbell was the lone Zondervan representative during the Oct. 16 taping. “They were great,” she said. “Jon and Kate were very friendly. It was nice to finally meet them after all the e-mails and phone calls, and the kids were just adorable.”