`` I Kissed a Girl `` is one of eight songs by Perry to sell over 4 million digital copies in the US , the others being `` Hot n Cold `` , `` California Gurls `` , `` Firework `` , `` E.T. `` , `` Teenage Dream `` , `` Roar `` and `` Dark Horse `` .
I Kissed a Girl is a work of literature .