"Irresistible" (also registered as "Irresistable" with the American Society of Composers, Authors and Publishers) was written specifically for Simpson by Swedish composers Anders Bagge and Arnthor Birgisson, in collaboration with English singer-songwriter Pamela Sheyne, who also contributed vocals for the demo. Initial recording of the song was done at the Murlyn Studios, Stockholm, for which Sheyne provided the background vocals with the final recording being done at Sony Music Studios, New York City. In an interview, Birgisson commented on the collaboration with Sheyne saying that: