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Macmillan Children's Books is to promote the release of the fifth series of The Princess Diaries with an integrated TV, press and SMS campaign designed to attract more girls aged 12-plus to join its loyalty club. A TV ad on Nickelodeon will invite viewers to enter a prize draw to win £500 of Topshop vouchers. Any users not subscribed to Macmillan's Princess Diaries Princess Club will subsequently be invited to join. Flytxt has handled the mobile marketing element.