Are Rachel Bilson and Nick Viall dating? The two sparked romance rumors on social media, when they exchanged flirty comments on each other’s Instagram posts. The O.C. alum met with the former Bachelor on July 24 for an appearance on his podcast, “The Viall Files.” Rachel, 38, told Nick, 38, what it was like navigating the dating world as a single mom. She also revealed that Nick DMed her in order to book the appearance.