The original cast members of "The O.C." took a trip down memory lane on Sunday night in Los Angeles, during the first and only performance of “The Unauthorized O.C. Musical."
Rachel Bilson, who played fan favorite Summer Roberts, posed for pictures with costar Autumn Reeser (Taylor Townsend) and the show's executive producers Josh Schwartz and Stephanie Savage at the special event.
The "Hart of Dixie" star also shared her excitement before the show with a photo of Greer Grammer, who took over her role for the night. Townsend
“I'm excited for this, even a tad bit jealous," she wrote on Instagram.
The series' famous moms, Kelly Rowan (Kirsten Cohen) and Melinda Clarke (Julia Cooper), also made an appearance on the red carpet.
Rowan tweeted a snapshot of the cast on stage, writing, "Here we go," as the show was about to kick off.
The cast, which included Tilky Jones (Ryan Atwood), Molly J. McCook (Marissa Cooper), Brendan Robinson (Seth Cohen) and Grammer (Roberts), retold the story of the uber-popular series, with memorable scenes including Seth and Summer's infamous "Spider-Man" kiss and Marissa shooting Ryan's brother, Trey.
The crowd was treated to some sweet music, of course, with live renditions of “Champagne Supernova,” “Hide and Seek,” “Hello Sunshine,” “Dice” and "California."