We're now well into December, however Joe has obviously grown fond of his thick bushy facial hair, which men grow in November to raise awareness of prostate and testicular cancer and mental illness.
The US pop star was pictured rocking his tash yesterday (10 December) as he left the gym in Los Angeles.
Joe was wearing his workout clothes, which consisted of a T-shirt emblazoned with the words: "Lighter than yours."
He looked very serious, although we're not sure we can take him seriously with such a 70s-looking moustache!
Joe rose to fame alongside his siblings Kevin and Nick in boy band the Jonas Brothers.
In October, however, the Jonas Brothers announced they had split up after eight years together.
In a later TV interview, Kevin, Joe and Nick admitted that they'd had "complications within the group".
Speaking about the moment he sat down with the band to discuss their future, Nick said: "In a nutshell, I said I felt we'd had some complications in the group for a while without addressing them and the train will fall off the tracks without addressing some of the concerns and limitations we may feel as a group."
Are you sad that the Jonas Brothers split? Tell us below, as the best comment from across the website each week wins £50.