Here’s some jarring news: Monday marks the 10th anniversary of The O.C., the Fox drama that became the watercooler prime-time soap of the 2000s, picking up right where Beverly Hills: 90210 and Melrose Place left off. Does that make you feel old? Imagine how Shailene Woodley, Max Greenfield, and Chris Brown feel. The trio is among the actors who can count The O.C. as one of their first gigs, getting wrapped up in the lives of Ryan (Ben McKenzie), Marissa (Mischa Barton), Seth (Adam Brody), and Summer (Rachel Bilson) long before they were household names themselves. Take a look at these stars who you may not have known had roles on The O.C.—and catch up on what they’re up to now.