Nicole Kidman and Keith Urban are couple goals! The award-winning actress and country musician have been married since 2006, and are still as madly in love now as they were then.MORE: Nicole Kidman and Keith Urban kiss on park bench in loved-up selfieTo mark Valentine's Day on Sunday, Keith took to Instagram to pay a public tribute to his wife, posting a gorgeous picture of the pair sitting in the back of the car on their way to a glitzy event, alongside a heartfelt message.The award-winning