Fresh from packing out Melbourne's Federation Square, the rappers from Belfast played a gig at Billboard in the CBD.
Kneecap's popularity has exploded since the release of an autobiographical film last year in which the band members play themselves.
The group raps in English and Gaelic and has expressed strong Irish republican sentiments in their music and interviews.
The band's concerts in Australia have sold out and thousands of people attended a free performance by the group in Melbourne's Federation Square.