Generative Artificial Intelligence (AI) is evolving into a collaborative creation tool, rather than merely an automatic solution, in the field of advertising. Human copywriters and designers have become the creators of brand stories that incorporate market knowledge, creativity, and cultural sensitivity over the decades. Nowadays, sophisticated AI-based models make the creative output more convincing, aesthetically pleasing, and highly customized to the demands. That is altering the paradigm of creative work as a whole through how they perceive and produce it. The current paper discusses the development of AI to transform it into a so-called creative copilot that complements but does not replace human creativity and includes such advantages as accelerated production, economics, data-driven creativity, and customization that goes beyond conventional campaigning. It also touches on some major issues, such as ethical concerns, intellectual property rights, and the danger of creating repetitive or homogenized material. Grounded in examples of case studies related to international campaigns and other early-adopting brands, the work uncovers how AI-powered tools such as ChatGPT, DALL-E, and Midjourney are used in ideation, creative design, and campaign optimization. What the findings can indicate is that the emergence of generative AI does not mean that human creativity dies; it is transformed, and what it opens to advertisers is the possibility to combine novelty with mathematical accuracy in a future where intelligent automation increases not only innovation but also productivity.