Los Angeles: Nicole Kidman has squelched rumours that she is romantically involved with Australian singer Keith Urban. Kidman and Urban raised suspicions when they were spotted riding together on Urban’s motorcycle. The two first met at a dinner hosted to honour Australians in Los Angeles in January. A spokesperson for Kidman told Pagesix.com that the two were just ‘friends’. Urban is currently touring with Kenny Chesney, Kidman’s co-star in the movie ‘Cold Mountain.’