Rebecca Black's 15 minutes of fame isn't over yet.
The viral-video vixen joined actually famous musician Katy Perry on stage at the Nokia Theater in Los Angeles this past weekend for a surprise performance of Black's silly hit single "Friday."
Adding to the crazy factor: The live team-up happened on Friday.
The two had previously collaborated this year, when Black co-starred in the video for Perry's similarly themed "Last Friday Night (T.G.I.F.)."
After the shortened rendition of the song, which Perry has covered during her concerts in the past, Black quickly left the stage. After the novelty singer was gone, Perry said, "Dammit, I love the Internet."