Daddy duty! Keith Urban strolls through Sydney Airport with daughters Sunday Rose, 10, and Faith Margaret, eight, as he continues Graffiti U tour Down Under

He's the doting father of two daughters with wife Nicole Kidman

And on Thursday, Keith Urban, 51, was on daddy duty as he escorted Sunday Rose, 10, and Faith Margaret, eight, through Sydney Airport.

The country star beamed as he took the girls through the terminal to catch a flight to Brisbane for the next stop of his Graffiti U tour.

Father takes flight! Keith Urban, 51, was doing daddy duty as he escorted Sunday Rose, 10, and Faith Margaret, 8, through Sydney Airport on Thursday

Father takes flight! Keith Urban, 51, was doing daddy duty as he escorted Sunday Rose, 10, and Faith Margaret, 8, through Sydney Airport on Thursday

Both girls wore matching dresses and ankle boots for the low-key outing. 

With her reddish-brown hair and porcelain complexion, Faith Margaret bore a striking resemblance to her famous mother.

Sunday Rose, who wore her hair in pigtails, looked more like her country superstar father. 

Is that you, Nicole? With her reddish-brown hair and porcelain complexion, Faith Margaret bore a striking resemblance to her famous mother, actress Nicole Kidman 

Is that you, Nicole? With her reddish-brown hair and porcelain complexion, Faith Margaret bore a striking resemblance to her famous mother, actress Nicole Kidman 

Just last week, the entire family were spotted attending a church service in Sydney's Lavender Bay.

Despite having previously been married to Scientologist Tom Cruise, Nicole is a devout Catholic who regularly attends church.

Keith and Nicole are famously private about their family lives, but the couple have taken to social media in the past to gush over their daughters.

Just like dad! Sunday Rose, who wore her hair in pigtails, looked more like her country superstar father

Just like dad! Sunday Rose, who wore her hair in pigtails, looked more like her country superstar father

To mark Sunday's 10th birthday in July last year, Nicole wrote on Instagram: 'Ten years ago today our little girl came into the world. You are our joy Sunday Rose. We love you, Happy Birthday.'

Just months later, in December, Nicole wrote a similar post for Faith, penning: 'Our baby girl turns 8 today. We love you so much. You bring us more happiness than we could have ever dreamed of. We love you Faith Margaret.'

Nicole and Keith are one of Hollywood's longest lasting couple, having tied the knot 12 years ago.

Church lady: Despite having previously been married to Scientologist Tom Cruise, Nicole is a devout Catholic who regularly attends church

Church lady: Despite having previously been married to Scientologist Tom Cruise, Nicole is a devout Catholic who regularly attends church

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Keith Urban strolls through the airport with daughters Sunday Rose, 10, and Faith Margaret, 8

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