Justin Bieber Racist 'N-Word' Controversy Continues, 'One Less Lonely N*gger' VIDEO Shocks Fans, Selena Gomez's Ex 'Jokes' About Joining KKK in New Clip

Strike two, Justin Bieber.

Just last week, a controversial video leaked online of the Biebs telling a rather distasteful, racist joke about black people (back when he was 15-years-old):

Read more on the full story (including the pop sensation's official apology) here:

Justin Bieber Racist 'N*gger' Joke Goes Viral, Offensive 'Never Say Never' VIDEO Leaks Online & Stirs Uproar

Selena Gomez Parties In Bathtub Amid Justin Bieber Racist Joke Apology [PHOTOS] 

Justin Bieber Racist N-Word Joke VIDEO Explodes on Twitter, Fans Support Singer with 'He Thinks He's Black!' Meme Photos [WATCH]

Several fans and fellow celebs came to Bieber's defense, claiming he was "young and immature" at-the-time - he didn't mean any real harm or offense.

Well, now more scandalous footage recently leaked online... involving JB's 2009 hit, "One Less Lonely Girl."

In the 24-second clip (originally obtained by The Sun), the singer changes his popular lyrics to "One Less Lonely N*gger." He also croons about joining the Ku Klux Klan.

Bieber allegedly "giggles" while disrespectfully altering the words to his hit tune.

A supposed insider tells The Sun:

"Unfortunately this is the devastating reality of how Justin has behaved and reveals his attitude toward such a deeply emotive subject... 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."

The time of this filming remains unknown, but it obviously happened after Bieber was signed to Raymond Braun Media Group and hip-hop icon Usher became the "rising star's" mentor.

Selena Gomez's ex has yet to respond to this latest scandal - although it appeared as Wednesday's cover story (June 4).

Stay tuned as more details develop...

UPDATE - Here's the video. Just one word, wow.