Chrissy Teigen stepped out in defence on The Hills star Kristin Cavallari after a recent picture of her sons attracted harsh criticism.

KC shared a family snap on Instagram, which showed her boys,Camden, 3, and Jaxon, 2, playing on the beach on Fourth of July.

Trolls picked up on the children's slight frames and accused Kristin of starving them.

One troll wrote: "Seeing pictures of your boys and how they look is a bit shocking to see! I know you cook healthy but to see the bones just doesn’t seem normal, sorry!"

Another added: "I understand you live a very strict dietary lifestyle but these children are very obviously nutritionally deficient.."

Chrissy, who is mum to two-month-old Luna, jumped to Kristen's defence.

She blasted the trolls on Twitter, saying: "I will never know why parents criticize others so harshly, knowing they'd go insane if they were on the receiving end ALLTHETIME.

"NO parent out there thinks they're perfect. I loathe these s—thead commenters. Who would want to make someone feel horrible for fun?"

She added: "anyway, love you @KristinCav and screw everyone's bored a**!"

Kristin replied, thanking Chrissy for the support: "lol thx girl love u and ur little girl is adorable."