The 18-year-old Baby hitmaker is currently renting a house behind the couple in Los Angeles and the pair reveals his teenage behaviour is becoming a problem, comparing the disturbance to that of a war zone.
During a joint appearance on U.S. chat show The View on Thursday (26Jul12), Shepard said, "The music and the parties and the paparazzi - I mean it's like living in Lebanon."
Notoriously-private Bell feels the same way, adding, "In his defence, I will say we don't know the exact house the music is coming from, we just know since he moved in, the music has been blaring. And it's not like super-late parties; it's just a lot of music, all the time."
And the Forgetting Sarah Marshall star insists the hoards of photographers who lurk outside the pop star's home are the worst: "The paparazzi thing is really annoying - because that is not our thing."