"That's probably the hardest thing," Bieber said. "Just being alone all the time. Because I'm always alone."
To combat the lonesomeness, Bieber says he brings along the most important companion of all -- his adorable dog, Esther. Not to mention his little brother, 7-year-old Jaxon, who occasionally comes to visit his big bro while he's on tour.
While he might feel lonely, Bieber must like something about being on the road. After the second leg of the star's European tour wraps in June, Bieber is kicking off his North American stadium tour, beginning with a performance at the Rose Bowl in Pasadena, California, on Aug. 5.