Pop star Katy Perry had quite the special guest at her Los Angeles concert on Friday night: Internet sensation Rebecca Black.

Dressed in a flowery pink number, Perry gave her seat to Black before the pair launched into a short rendition of Black's YouTube hit, "Friday."

"Give it up for the infamous Rebecca Black!" Perry shouted to the crowd at the Nokia Theater.

The "Friday" performance included fist pumps, hand waves and complete adoration from Perry, who told the young singer, "This was our moment . . . Damnit! I love the Internet!"

Black and "Friday" first made headlines in March, when the 14-year-old released the music video on YouTube and gained more than 160 million views. The song received much criticism from the music industry, with some calling "Friday" the "worst song ever," according to the L.A. Times.

The "Friday" music video has since been removed from YouTube due to copyright issues, but that hasn't stopped fans and the like from making video parodies and mash-ups, including one from a fake Bob Dylan.

In July, Black released her second single, "My Moment," under her own label, RB Records.

Friday's L.A. concert was not the first time Black and Perry have paired up.

Black was among a long list of stars that appeared in Perry's music video for "Last Friday Night (T.G.I.F.)," along with Darren Criss from "Glee," Debbie Gibson, Corey Feldman and the music group Hanson. Since its June premiere, the music video has gained more than 72 million viewers on Perry's official YouTube channel.

On Sunday, Black was honored with a surfboard award for Choice Web Star at the Teen Choice Awards, where the singer rubbed shoulders with Justin Bieber, the Black Eyed Peas and Taylor Swift.