Rebecca Black's "Friday" is "Creepin' on Up" the iTunes Charts!

Since Rebecca Black's debut single "Friday" went viral on YouTube, the pop ditty has also become a viral topic of conversation in the blogosphere. Dubbed by some as the "worst song ever," Rebecca's "Friday" is slowing climbing up the iTunes charts. Watch out Justin Bieber — another pop singer is hot on your heels!

OK! NEWS: REBECCA BLACK — "FORGET BIEBER FEVER, I'VE GOT THE BLACK PLAGUE"

Rebecca Tweeted "Creepin' on up! Goodnight everyone!" with the below picture of her song "Friday" slowing climbing the iTunes charts, and resting at No. 74.

The hashtag #threewordstoliveby has also been trending on Twitter, as she Tweeted: "#threewordstoliveby : Friday Friday Friday."

Catch some other notable quotes from the 13-year-old singer, who has a recording contract, below:

• Uhmm, I'm not going on tour anytime soon guys! It'd be tough with only one song! lol :) xoxo.

• If we were honest and both wrote a sonnet, together a sandwich with everything on it <3

• Haters will be haters! Thanks to all those for the compliments though! :) #WINNING

• "Forget Bieber fever, I have the Black Plague" hahahaha - made my day.

And if you can't get enough, watch Rebecca's "Friday" music video, which has reached close to 13 million hits! Are you sick of the Black buzz yet? Sound off in the comments!