Nicole Kidman's three-year-old daughter wants to be a rock star.

'The Railway Man' actress' youngest daughter Faith has already been getting guitar lessons from her musician dad Keith Urban because she wants to play alongside her famous father on stage one day.

The family follows 'American Idol' judge Keith on tour around the US and while their eldest daughter Sunday, five, groans at the prospect of watching her dad on stage, their youngest child is his number one fan.

Nicole explained on chat show 'Jimmy Kimmel Live': ''They get to be beside the stage even though my oldest daughter is like, 'Eurgh I so don't wanna go and watch dad play', I'm like, 'Sunday at least act a little bit enthusiastic!' The little one will stand there with her guitar aside the stage. She's three.''

While Nicole is encouraging of her musician daughter, her 'American Idol' judge husband is much more critical.

She added: ''I always say to her, you stick at that guitar and you can be out there on the stage with her dad. Keith's tough he's like, 'Hmm the pitch', I'm like, 'Shush, she's three!' He's like, 'I'm not going to sugar coat it.' He's teaching her chords and everything.''

Nicole, 46 - who also has two grown-up children, Isabella and Connor, with her ex-husband Tom Cruise -also revealed Sunday has ambitions of following in her mother's footsteps by becoming an actress.

She added: ''My oldest daughter is interested in acting and my youngest daughter is interested in music so it's a very divided family.''