Russell Crowe has confirmed actress Nicole Kidman is smitten with new love Keith Urban.The heartthrob actor – who once dated Nicole - says the flame-haired beauty is head over heels with the country star.He is quoted in Britain's The Sun newspaper as saying: "I've spoken to Nicole a couple of times recently and it was clear she's enjoying great happiness right now. Hanging out with Keith is giving her a lot of joy and I'm happy for her"But the star fears the high-profile couple won't be able to stay together – referring to his own doomed romance with actress Meg Ryan.He said: "A relationship under that microscope doesn't get the chance to evolve. It happened to me some years back. My summer was ruined as we were never left alone"Last month, it was claimed Nicole and Keith were getting serious after inviting their parents to spend Thanksgiving with them. The actress reportedly flew with her mum and dad to Keith's Tennessee home for the annual celebration.The following day, Nicole and her father were seen out jogging, while Keith and the two mothers took a stroll together. The couple and their parents were later photographed out shopping together.