According to various sources, Kidman and Urban spent some time together in Sydney, Australia.
The country singer has completed his treatments at an American rehabilitation centre for his dependence to alcohol.
The two stars shared a private film viewing. Kidman, who starred in the films The Hours and Bewitched, among others, did not comment to the media.
Urban, 39, arrived in Australia yesterday, while Kidman, also 39, was in their home country filming a movie.
Keith Urban recently was voted best singer for the second year in a row by the Country Music Association Awards in Nashville.