It's the second video to surface in the last week and the latest Bieber blunder to garner negative publicity for the singer. The "Beauty and the Beat" crooner's last year has already included an arrest in Miami, controversy over an egging incident and an attempted robbery case.
Needless to say, tolerance for his antics has sharply dropped off and a petition -- though unsuccessful -- has already attempted to deport the singer to his native Canada.
The first video, released over the weekend, showed the "Baby" crooner using the racial slur as a punch line of a joke. The singer has since apologized for using the "hurtful" language, calling it a "childish" and "inexcusable mistake."
The latest recording shows the YouTube sensation appearing solo in front of the camera as he sings a modified version of his 2009 hit "One Less Lonely Girl." However, instead of saying "Girl," he weaves the epithet into the lyrics, the footage shows.
In the short clip, the grinning Bieber closes the lyric with, "If I kill you, I'll be part of the KKK." Repeated giggles are heard from off-camera.
"Unfortunately this is the devastating reality of how Justin has behaved and reveals his attitude toward such a deeply emotive subject," a source told the tabloid (via New York Daily News). "People need to see this. Normal kids in society do not make these kind of jokes. He is protected by a network of staff, but the camera doesn't lie. This is the real Justin."
As it happens, one of the singer's latest tweet urges followers to "be kind and loving. It is a great way to live."
TMZ reported that Bieber was only doing a parody of a parody, which featured a comedian singing the modified version of the song.