Country singer Keith Urban has proven the spark is still strong in his marriage to Nicole Kidman after he took her out for a romantic evening of fun on her birthday.

The couple, who have been wed since 2007, stepped out with the musician's family for a low-key meal at a Greek Australian restaurant last night (June 20th) before heading to a Lady Gaga concert.

Photographed leaving the Appollo in Points Point, the 45-year-old actress looked happy and relaxed as she walked hand-in-hand with her handsome husband.

The usually-stylish beauty was dressed more for warmth as she wrapped up in a coat and scarf, with temperatures dipping to as cool as four degrees in the Australian city.

Also joined by Kidman's parents, the couple may have been enjoying a double celebration, as their sixth wedding anniversary approaches at the end of this month.

Their four-year-old daughter Sunday's birthday comes just one week later, while 18-month-old Faith will turn two this year.