Rachel Bilson bicycle basket helmet sunglasses Rachel Bilson bicycle basket helmet sunglasses

Rachel Bilson and her hunky ex-boyfriend Hayden Christensen were spotted riding bikes together in Studio City the other day, and after landing at NYC's JFK airport last night, it seems as though they've rekindled their romance! Rachel and Hayden first started hooking up in 2007 and got engaged a year later, but they've broken up and gotten back together so many times over the years we've lost track. So what's next for these two? Stay tuned...