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One of the Boys is the second studio album by American singer-songwriter Katy Perry and her major-label debut. Her change in record label and adoption of a pseudonymous surname accompanies a notable shift from the Christian gospel rock of her self-titled debut album. The album was released in the United States and Canada on June 17, 2008. The album features the Billboard Hot 100 number one single "I Kissed a Girl," top 3 single "Hot N Cold," top 10 single "Waking Up In Vegas", and top 30 single "Thinking of You".