When JLO and P Diddy were caught partying together at the AMAs afterparty and it felt like 1999.

This image appears in the gallery:
50 Photos That Music In 2015 Will Be Remembered For

1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 

10. 50 images

See the full gallery: 50 Photos That Music In 2015 Will Be Remembered For