Katy Perry & John Mayer Party & Perform Together Ahead of New Year's Eve!

Katy Perry and John Mayer avoid attention while leaving The Nice Guy after partying way in to the morning on Thursday (December 31) in West Hollywood, Calif.

Fans are never quite sure if the 38-year-old entertainer and 31-year-old superstar are officially together or not! They’ve been on and off since 2012, and it looks like they’re on right now!

At the celeb hotspot, Katy performed “Natural Woman,” and we can only imagine John is strumming along on the guitar! Listen below.

10+ pictures inside of John Mayer and Katy Perry leaving The Nice Guy together…