It’s baby’s first road trip! New parents Rachel Bilson and Hayden Christensen were spotted making a pit stop while taking a cross-country trip in an RV with their baby girl Briar Rose Christensen and Bilson’s parents. The casually dressed lovebirds left Los Angeles yesterday.They were snapped by shutterbugs while making a quick stop to refuel and grab some snacks at a gas station along their journey. Hayden kept it cool in a zip-up hoodie and jeans while his leading lady stayed comfy in sweats and a long-sleeve shirt while carrying their purchases back to the RV. The longtime couple kept their little girl’s arrival secret until November 6th. For those who don’t know the story behind their daughter’s Disney princess-inspired moniker, Briar Rose was the nickname that the three fairies called Princess Aurora in Sleeping Beauty.