premise: The album One of the Boys contains I Kissed a Girl.
hypothesis: `` I Kissed a Girl '' is a song recorded by American singer Katy Perry for her second studio album , One of the Boys ( 2008 ) . One of the Boys is the second studio album by American singer Katy Perry . The first single released from the album , `` I Kissed a Girl '' , became her first Billboard Hot 100 number-one single ; the second single `` Hot n Cold '' reached number three in the US while topping charts in Germany , Canada , the Netherlands , and Austria .