Perry, 26, was annoyed when her comments about the use of product placement were taken out of context and it was implied she was speaking about a version of Britney Spears' video for Hold It Against Me.
Speaking at the Oscars, Brand said to MTV News: 'I think those situations are made up in the papers and the media to distract people from our spirituality and the truth, and it distracts us from the way the economic situation of the world keeps certain people trapped on this plateau. Let's all rise up and join together. Unite!'
Perry's comments on her Twitter page came when she was asked about product placement by another artist.
She wrote: 'Do it with style and grace… Not so in [your] face like some. [You] have to get creative with it. Some artists don't care [though, and you] can tell.'