51-year-old Nicole showed off her lithe limbs in a polka-dot white and black bikini – while she shaded her fair skin from the sun’s rays with a wide-brimmed white hat.
The star – who now resides in Nashville with Keith – wore mirrored glasses and covered up with a chic white shirt.
Keith meanwhile wore simple black shorts and showed off his trademark tattoos by going topless in the Australian sun.
At one point Nicole could be seen holding aloft what appeared to be a can of sunscreen – no doubt to keep her precious children’s skin safe in the heat.
Nicole and Keith’s daughter Faith turned 8 on Dec. 29 – an occasion Nicole marked with a poignant post on Facebook.
“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 xx,” the star wrote.
And on Boxing Day, the Aussie icon shard a heartfelt photo of her and country music legend Keith to social media – showing the pair embracing.
“Wishing you love, laughter and joy,” Nicole wrote simply.