The 18-year-old pop star is currently renting a house behind the couple in Los Angeles, and Shepard compares the disturbance to that of a war zone.
During a joint appearance on "The View" on Thursday, Shepard said, "The music and the parties and the paparazzi -- I mean, it's like living in Lebanon."
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The notoriously private Bell added, "In his defense, 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 says the hordes 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."
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