Justin Bieber isn't having the best week!

Only days after the 20 year-old singer issued an apology, after he was caught on camera several years ago using the N-word in a racial joke, another clip has emerged.

In this video Bieber raps about killing a 'N-word' and joining the Klu Klux Klan.

British tabloid The Sun published the 24-second long clip, which shows the Canadian superstar change the words of his 2009 hit 'One Less Lonely Girl' to One Less Lonely N----.'

The disturbing and racial footage, in which a girl can be heard laughing in the background, just adds to the speculation that Bieber is a racist.

'One Less Lonely Girl,' which has over 203 million hits on YouTube, was written by his mentor, and R&B star, Usher. Although he has been loyal to Bieber throughout the youngster's controversial behaviour, he has yet to comment on these pieces of footage.

"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 Sun. "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."

It is still unclear when the footage was filmed, but it was definitely after he was signed by the Raymond Braun Media Group "and was a rising child star," according to the newspaper.

A day after the first clip surfaced, showing a 15 year-old Bieber ask "Why are black people afraid of chainsaws?," before delivering the offensive punch line: "Run n-----, n-----, n-----, n-----, n-----," he issued an apology.

MORE: Amid Racism Storm, Justin Bieber is Defended by Floyd Mayweather Jr

"I learned from my mistakes and grew up and apologized for those wrongs. Now that these mistakes from the past have become public I need to apologize again to all those I have offended," he claimed.

MORE: Usher Refuses To Speak Up For Justin Bieber Over Racist Joke

The 'Baby' singer has yet to comment on the most recent controversial footage.

Justin Bieber
How will Bieber get himself out of this scandal?