Aug. 6 (UPI) -- Former The O.C. star Rachel Bilson posted a throwback photo on the series' anniversary.
The 36-year-old actress, who played Summer Roberts on the Fox series, shared a picture of the cast 15 years after the show's premiere.
"15 year anniversary of The OC. I can't believe it. I also can't believe I wore a skirt I got at a thrift shop as a shirt #ifeelold #survivedtheschwartzsharkattack," she wrote.
"I mean, I would do it," the star said. "I'll tell you about three people that wouldn't do it -- five people? Six people? Eight people, let's be honest."
"It was pretty crazy," she added of her time on the show. "I guess I didn't really know what to expect. I think we kind of felt like, 'Oh, this could be a special thing.' It was a weird time, but it was a lot of fun."
Bilson portrays Sam Swift on the new ABC series Take Two, which airs Thursdays.