Actress Rachel Bilson is reprising her role as Summer Roberts from The O.C. in a new campaign for 21Seeds Infused Tequila, featuring iconic references to the show and collaborations with its creators. The campaign, launching on various digital platforms in July, celebrates the 21st anniversary of The O.C.'s premiere. Bilson's involvement highlights the Y2K nostalgia trend and the brand's alignment with fans of the beloved series. The ads pay homage to the show with callbacks to memorable moments and characters like Marissa Cooper, incorporating the show's theme song and iconic catchphrases. Bilson's return to the role has sparked excitement and nostalgia among fans, coinciding with the show's enduring popularity and cultural impact.