The star, who played Summer Roberts on the beloved show, posted a throwback of the cast including Mischa Barton, Adam Brody, Melinda Clarke, Peter Gallagher, Kelly Rowan and Ben McKenzie.
“15 year anniversary of The OC,” Bilson captioned the pic. “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 #welcometotheocbitch #ew.”
Back in June, Bilson opened up about her time on the show, which ran from 2003 to 2007.
“It was such a special time,” she told People. “The characters were really well thought out and there was so much chemistry between everyone.”
Bilson dated co-star Adam Brody on and off screen before they split in 2006. She went on to welcome daughter Briar Rose with ex Hayden Christensen in 2014.
While there has been no official talk of an OC reboot on the cards (yet), Bilson says she’d be down.
“I’m always open to things,” she previously told E! News. “I don’t know what it would look like with our characters being old now. We were riding skateboards on the pier; I don’t know what they do now as 30-year-olds. But it would be nice to see everybody again.”
BRING. IT. BACK.