In early 1964, Boyd appeared in a television advertising campaign for Smith's crisps, directed by Richard Lester. Lester then cast her as a schoolgirl in the Beatles' 1964 film "A Hard Day's Night", where she met and befriended the group's lead guitarist, George Harrison. Boyd's modelling career skyrocketed as a result of her subsequent romantic involvement with Harrison. Boyd first exhibited her photos of Harrison and Clapton at the San Francisco Art Exchange on Valentine's Day 2005, in a show titled "Through the Eye of a Muse". The exhibition appeared in San Francisco and London during 2006, and in La Jolla, California in 2008. "Through the Eye of a Muse" was also shown in Dublin and in Almaty, Kazakhstan, in 2009 and 2010.