If Selena Gomez did indeed get a nose job, it was very well done. The reason for that is because it retained the same character it used to have. If you have to guess on whether or not someone got a nose job, than it's safe to assume that it was well done. A good rhinoplasty should look like you got a good haircut or something along those lines. It should leave the person saying, "Wow, you look good. What's different?"