Now that she’s back with her ex Hayden Christensen, Rachel Bilson needs a new ring for their brand new start. The “Last Kiss” actress was spotted out at a jewelry store in Beverly Hills in search of some new left-hand bling today (November 10). According to an inside source, Rachel and Hayden just needed a break from their relationship to get some perspective before coming back together. “They’re dating again. [Before] it just wasn’t working out.” Rachel and Hayden have been spotted out and about together as of late...