Nicole Kidman's children are her biggest fashion critics.

Nicole Kidman and Keith Urban at the G'Day USA Gala

Nicole Kidman and Keith Urban at the G'Day USA Gala

The 47-year-old actress' two daughters, Sunday Rose, six, and Faith, four, always tell their mother what they think of her outfits especially when she is getting dressed up for red carpet events.

Before heading off to co-host the G'Day USA Gala and AACTA International Awards in Hollywood on Saturday (31.01.15), Nicole's cheeky kids told their mum that she looked "too tall" in her high heels.

Nicole - who was accompanied by her husband Keith Urban - told E!: "My daughters were like, 'Hmm, you're too tall.' They don't like it when I wear high shoes. I keep telling them they're going be tall one day."

The 'Paddington' star co-hosted the ceremony with Geoffrey Rush and wore a black Altuzerra gown.

Nicole insists she now chooses her red carpet dresses more for comfort than to make a statement these days.

Explaining why she opted for the gown, she said: "It was comfortable. It's a big thing right now for me."