The couple, who celebrated their three year wedding anniversary in June, put on a show of affection during Roger Federer's win against Tommy Robredon in New York.
Nicole, who wore an elegant satin dress, suede jacket and trilby hat, exchanged kisses and adoring looks with her husband as they sat in the stands.
Love match: Nicole Kidman and Keith Urban shared a kiss in the stands at the US Open in New York yesterday
Eye off the ball: The couple also exchanged adoring looks
The country singer was enjoying a night off from his world tour, which takes in the US, Canada and his native Australia.
He recently admitted it is difficult being away from Nicole and their 1-year-old daughter Sunday Rose, saying: 'It's very hard to have days that I'm not with my family.'
The tight trio are usually based in Nashville, Tennessee, while Nicole's older children Isabella, 16, and Connor, 14, live in New York with their father Tom Cruise.
Having a laugh: Keith was in high spirits as he enjoyed a night off from his gruelling 27-date world tour
Getting in the swing: The pair were in the stands as Roger Federer's defeated Tommy Robredon
While Nicole enjoys nesting with her young toddler, she also has a few projects of her own on the boil, including an appearance in a special edition of US fashion show Project Runway.
She will appear alongside the show's presenter Heidi Klum, and will apparently help to set up a design contest for eight top contestants from past series.
She is also due to begin promoting her new movie Rabbit Hole, which is about the mother dealing with the loss of a child.
Frock star: The actress looked elegant in a satin dress and peep-toe heels
