At her show in Melbourne, Australia, Katy Perry gave the audience a surprise when she performed a cover of Rebecca Black's song "Friday." While Rebecca's version is upbeat, Katy slowed it down with an acoustic version. She even had a cello player to accompany her! Like Katy says in the video, "All magical things happen on a Friday."
Check it out:
Which version of "Friday" do you like best?
Photo: Courtesy of ABC