Fans and plastic surgeons believe that Leighton Meester got a nose job. She most likely got the plastic surgery in her late teens or early 20's. The before and after picture shows that her nose used to stick out more and was a little wider. The tip protruded and the the bridge was thicker than it is now. Her nose is now pushed in more, thinner, and more petite overall.
This before and after picture shows Leighton Meester in high school. It looks like her nose used to even be a little crooked.
If Leighton Meester got a nose job, it was very subtle and well done. The lighting is a little too bright in the before picture, but it still looks like her nose used to be wider in the tip and bridge.