And the singer confirms he saw no evidence of any undue relationship between the Australian actress and married co-star JUDE LAW - even though it had been reported the pair had an affair during the shoot.
Jack says, "Not that I saw! Nicole was really cool. We hung out a lot.
"To be so popular and so beautiful at the same time must pose so many challenges for her but she's incredibly down-to-earth despite her very public existence."