Kylie Minogue's boyfriend Olivier Martinez has defied pressure from movie bosses to return to his latest film set - so that he can look after his sick girlfriend.

The "Unfaithful" star, 39, - who was tipped to make his Hollywood breakthrough with the movie - has refused to cave in to demands on his filming commitments to remain with 36-year-old Kylie as she recovers from surgery for breast cancer, reports Internet portal Femalefirst.

The couple that has been dating for two years was planning to try for a child. However, they've decided to put the plan on hold for five years with doctors warning them they can't start a family until she is completely free from the disease.

"The real blow to them is not so much the cancer itself - it's that they have to put off trying for a baby," said Olivier's brother, Vincent.