Two posters one of Cyrus and one of Gaga which feature nude images of the singers, taken by controversial photographer Terry Richardson, were pasted at several places by controversial right wing artist Sabo, according to The Hollywood Reporter.
The posters had the text "Long live music" and "#WeAllKnew", the latter in reference to those who kept quiet about sexual assault allegations in the media.
The incident happened before the scheduled performances of Gaga and Cyrus at Grammy Awards, which was held at Madison Square Garden in New York City today.
"How can anyone be upset with me putting these up when no one seems upset about what the music industry pushes to our kids?" he asked.