Clarkson recently shared a Game of Thrones-themed holiday card featuring husband Blackstock, their daughter River Rose and Blackstock's two children. The image included the motto "Winter is Coming."
The original American Idol winner, 33, recently detailed her rough experience being pregnant for the second time. "I'm familiar with all-day sickness," she said during a television appearance in November. "I have to get IVs and fluids because