Justin Bieber Tweets About Rebecca Black: "Sunday Comes After Saturday?"

While appearing on Good Morning America, Rebecca Black asked Justin Bieber if he would sing a duet with her. Well, there's been no official response from The Biebs just yet, but he didn't Tweet about Rebecca over the weekend.

OK! NEWS: REBECCA BLACK ASKS JUSTIN BIEBER "WILL YOU SING A DUET WITH ME?"

Rebecca not only has Bieber Fever, but she's also been compared to the singer after her song "Friday" and YouTube music video went viral.

Despite her viral status, not everyone is a fan of Rebecca's music. The 13 year old appeared on GMA last week to defend her singing talents and also had the opportunity to send a message to her idol.

“Justin, if you’re watching this right now, would you do a duet with me?” she asked the teen heartthrob. “That would be just unreal — it would make my life!”

OK! NEWS: REBECCA BLACK URGES FOLLOWERS TO RE-TWEET HER "DUET" MESSAGE TO JUSTIN BIEBER

She even then encouraged her Twitter followers to spread the word to Justin. So what did he have to say?

Justin Tweeted on Saturday, "sunday comes after saturday? weird."

Not sure about you, but it sounds to us like Justin's kind of making fun of Rebecca's "Friday" song lyrics?

What do you make out of Justin's Tweet? Do you think that's pretty much a "no" to singing a duet with her?

Listen to Rebecca's "Friday" song below!