Joe Jonas is shutting down a WILD fan theory! While the Jonas Brothers were performing in Los Angeles on Saturday night, the Toothbrush crooner was caught on camera checking out his reflection in a mirror and rubbing his nose backstage. Eagle-eyed fans posted various videos of him using a towel to wipe off his nose as he made sure he was all cleaned up before heading back to sing. Related: Taylor Swift & Travis Kelce's Engagement Will 'Ruin Some Relationships' Ch-ch-check it out: @estilodf Joe Jonas preparándose para salir al escenario con los Jonas Brothers en California.