Perttu Päivö Kullervo Kivilaakso (born 11 May 1978 in Helsinki, Finland) is a cello player for Finnish band Apocalyptica. Like fellow band members Eicca Toppinen and Paavo Lötjönen, he attended Sibelius Academy in Helsinki. He plays a German 19th century cello; he started playing the cello when he was 5 years old and joined Apocalyptica for their third studio album Cult. Kivilaakso played in Apocalyptica's 1995 line up, but he was concentrating on his studies when the band began their professional career. At the end of 1999 he came back, switching places with Antero Manninen, who then went to play in a classical orchestra.