Justin Bieber Hangs Up on Radio Host After Line of Questioning Goes Too Far (AUDIO)

Gregg DeGuire, WireImage

New rules for anyone interviewing Justin Bieber -- don't mention anything about Justin Timberlake, One Direction, and especially not his mama! During a Q&A to promote his newest album Believe, the Biebs angrily hung up on Detroit's 106.7 show, "Mojo in the Morning" after the DJ's line of questioning did just that.

Radio host Mojo made his first mistake when he told Justin he thought "Boyfriend" was by the other Justin, Timberlake that is, upon first listen. Of course, JB already has a history of adamantly rejecting such comparisons, and this time was no exception.

Strike two: Mojo brought up Bieber's growing friendship with the guys of One Direction as a way to segway into a comment about member Harry Styles' latest sex scandal with a much-older married woman. He then asked Bieber if he was afraid to leave Harry around his mom, to which Bieber snapped, "I think you should worry about me around your mom, bro."

When Mojo mentioned his mother was dead, a speechless Bieber hung up the phone. Attempts by JB's rep to get him back on the line were to no avail. "He got a little upset with the question, to be completely honest with you and he probably wont be calling back," she told the radio host.

And there you have it! How to push Bieber's buttons in 5 minutes or less! Listen to the awkward interview below.

Listen to Bieber's "Mojo in the Morning" Radio Interview

See Justin Bieber Get "Beat Up" in Complex Magazine

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Watch Justin Bieber's "Boyfriend" Video