"Bigger than Bieber," the 47-year-old rock icon's caption reads. Ahhhh, so THAT's why Manson is rocking a Bieber shirt! See photos from Bieber's recent Purpose tour opener in Seattle:
Is it all in good fun, or does Manson take issue with Bieber rocking his likeness in concert? Maybe we'll find out when Manson, who released The Pale Emperor in 2015, tours with Slipknot later this year.