Ariana Grande just had THE best comeback for this online hater!

Ariana Grande might look sugary-sweet on the outside, but she can be fierce when she wants to!

We've heard rumours that the Problem singer can be a bit of a diva when it comes to dealing with the press, but it turns out Ariana was saving her best sass for a horrible Twitter troll.

The star shared some pictures of her recent night at the Grammys on Instagram, and one follower made a pretty in appropriate comment about the size of her breasts, writing "My 9 year old sister has bigger t*ts than you."  

Less than a minute later though, Ariana was back with an EPIC burn:

In summary, don't get on Ariana Grande's bad side because she will OWN you!