The teeny tiny pint-sized pop princess, who shot to fame when she played Cat Valentine in Nickelodeon sitcom, Victorius, looks SO different to how she did a few years ago.
Writing on her Tumbler account last summer, Ariana said: "Yes, I lost a bit of weight last year. It's because I stopped eating junk food and started making healthy choices. I was happy with the way I was before and I'm still happy now! Just healthier!"
The 20-year-old went on to insist that her lifestyle change was never about being skinnier.
"I just wasn't taking care of myself at all," she writes. "I was making really poor choices.. This is about making sure the foods you put in your body will nourish you and be put to good use."
"The reason why I lost so much weight as I did is because I used to live on junk food," she continues. "So I drastically changed my eating habits, started excising daily, and I'm all around a healthier me."
We're glad to hear it, Ariana.