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These included Cosmopolitan magazine (from which Hearst took the film company's name) as well as Harpers Bazaar and Good Housekeeping.
The novel - a story of intrigue involving four brides-to-be with secrets - was excerpted by Cosmopolitan Magazine and released as a made-for-TV movie starring Connie Sellecca, Twiggy and Ken Howard.
During the 1960s, she also wrote cultural pieces for Cosmopolitan as the new editor, Helen Gurley Brown, markedly changed its character.
In June 2006 Costa posed naked for Cosmopolitan magazine's 10 Years of Naked Male Centrefolds, alongside other stars including singer Ronan Keating, actor Danny Dyer, Labour MP Jim Devine, and TV presenter Craig Doyle.