Ariana Grande has taken a stand against a cyberbully who poked fun at pop star's body.

An Internet troll took aim at Grande's small backside after she posted a clip of her NBA All-Star game half-time performance with Nicki Minaj online on Sunday (15Feb15), and the singer has fired back by confronting the critic.

She writes, "ppl (people) are so ignorant sometimes. stop trying to make people feel badly about their bodies. its (sic) okay to be different... to be curvy or to be thin. when did it become socially acceptable to comment on what you think is 'wrong' with other people's bodies?? we were having fun! dancing on stage.

"i'm shaking my pretty, cute, petite a** next to nicki's pretty, big booty. both are f**king awesome. how about we respect people's body boundaries and encourage each other to feel like a babe no matter how they are?

"That's be (sic) nice. so tired of watching everyone try to tear each other down."