Rachel Bilson celebrated the 21st birthday of her hit sequence The O.C. on Wednesday (July 31) in Los Angeles.

The 42-year-old actress, who performed Summer Roberts on the favored present, marked the event at an occasion, which additionally signified the launch of The O.C. x 21Seeds “Serving Summer” marketing campaign, a collaboration with the tequila model.

For the event, she regarded trendy in a bubblegum pink costume with cutouts and a floral accent. Rachel wore her hair down and paired the costume with an identical bag and platform heels.

While there, she opened up about the place she thought Summer could be now and mused that she could be rivals with the character.

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Speaking to People, Rachel thought that Summer would have wound up being a science trainer and a mother.

“I think she’s very involved. She is president of the PTA, clearly,” she mused.

Rachel continued, including, “I think we would be [in] a rivalry. No, we would have a love-hate relationship… and we would compete like who’s the best mom.”

The actress just lately weighed in on if she was thinking about doing a reunion for the present.

Scroll by way of the brand new pics of Rachel Bilson within the gallery…