As a famous diva, plastic surgery speculation is inevitable for Ariana Grande. These before and after pictures are focused on her alleged nose job, boob job, lips (lip injections) and eyes (eye lift).
Did Ariana Grande get a nose job?
This old photo shows how the bridge of her nose used to look slightly wider. Also, the tip of her nose looked more ball shaped and bulbous. Her plastic surgery would have been extremely subtle and truly sensational if it indeed happened.
The difference here could just be due to lighting. Regardless, her nose looks smaller in the after picture.