Actress Nicole Kidman and country star Keith Urban like to spice up their relationship by sending each other saucy text messages.

The singer is currently juggling his tour commitments with filming for reality Tv show American Idol, on which he is a judge, while his movie star wife is shooting on location in London.

The couple has imposed strict rules about keeping in touch while they're apart, but Urban admits they have both broken their own rules as they try to find new ways to keep the spark in their romance alive after seven years of marriage.

During a taped interview with U.S. talk show host Ellen DeGeneres, which will air on Monday (28Oct13), Urban said, "We just make it work. We never text, we never email. Phone calls only, which I really love that."

However, the Without You hitmaker then grew embarrassed as he confessed, "Maybe one text. Maybe one cool kind of, you know... Nice sex texting. I'm a little red right now."