Before and after pictures lend credence to fact that Scarlett Johansson probably got a nose job. The reason it looks like she got plastic surgery is because her nose used to undoubtedly be bigger. The before picture where she’s about 17 years old shows that her nose used to be wider in the bridge and tip.
While the tip of her nose is still little bulbous now, it’s definitely smaller than it used to be. The nose job would have probably been very subtle by only narrowing the bridge and tip by 3 millimeters max. You can’t deny that her nose looks stunning now though.