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\t\t\t\t<\/p>\n Rachel Bilson<\/strong><\/a> celebrated the 21st birthday of her hit series The O.C.<\/strong><\/a><\/em> on Wednesday (July 31) in Los Angeles. <\/p>\n The 42-year-old actress, who played Summer Roberts on the popular show, marked the occasion at an event, which also signified the launch of The O.C. x 21Seeds<\/em> \u201cServing Summer\u201d campaign, a collaboration with the tequila brand. <\/p>\n For the occasion, she looked stylish in a bubblegum pink dress with cutouts and a floral accent. Rachel<\/strong> wore her hair down and paired the dress with a matching bag and platform heels. <\/p>\n While there, she opened up about where she thought Summer would be now and mused that she would be rivals with the character. <\/p>\n Keep reading to find out more\u2026<\/em><\/strong><\/span><\/p>\n Speaking to People<\/a>, Rachel<\/strong> thought that Summer would have wound up being a science teacher and a mom. <\/p>\n \u201cI think she\u2019s very involved. She is president of the PTA, clearly,\u201d she mused.<\/p>\n Rachel<\/strong> continued, adding, \u201cI think we would be [in] a rivalry. No, we would have a love-hate relationship\u2026 and we would compete like who\u2019s the best mom.\u201d<\/p>\n The actress recently weighed in on if she was interested in doing a reunion for the show<\/a>.<\/p>\n Scroll through the new pics of Rachel Bilson in the gallery\u2026<\/strong><\/em><\/p>\n <\/span><\/p><\/div>\n