Bieber was one of many stylish stars who chose to go sparkle-free on New Year's Eve. Rihanna, for example, wore only black leather—slouchy over-the-knee boots and a bomber jacket —for her Dec. 31 outing. Selena Gomez, meanwhile, went for a simple LBD (her signature move) and let her massive engagement ring act as her outfit's only glitz.

The contentedness also stems from the married couple still need a bit more time to become fully acclimated to caring for a little one. Justin and Hailey are reportedly “still adjusting to life as parents of a newborn” and take “every day is a learning experience.”

Hailey Bieber celebrated New Year's Eve wearing a bikini and a "Happy New Year" headband, as one does, and if you're first thought was "I need this swimsuit for the vacation that I don't have tickets for yet," you are not alone.