Krishnakumar Kunnath (born 23 August 1968), popularly known as KK or Kay Kay, is an Indian playback singer. He is a prominent singer in Hindi, Telugu, Tamil, Kannada and Malayalam films.

Born in Delhi to Malayali parents C. S. Nair and Kanakavalli, Krishnakumar Kunnath was brought up in New Delhi. KK sang 3,500 jingles before Bollywood break. He is an alumnus of Delhi's Mount St. Mary school. He appeared in "Josh of India" song for the support of Indian Cricket Team during Cricket World Cup 1999. Following this, he released an album called Pal for which he received a Star Screen Award for the Best Solo Album. He successfully launched the Album Humsafar 8 years after the first album, in Jan 2008. Humsafar, came eight years after the release of KK's super-hit debut album Pal.[1] It belongs to the pop-rock genre and has a total of 10 songs. Humsafar has two songs – "Din Ho Ya Raat" and "Mehki Hawa" – from Pal, KK's earlier album. The album has a fun-filled romantic number – "Aasman Ke", featuring the singer and a south Indian model, Suhasi Goradia Dhami, in the video. "Humsafar", the title track, an interplay of English and Hindi lyrics, is about one's conscience and how it is a constant companion in the journey of life. One of the songs, "Yeh Kahan", was penned seven years before the release and "Dekho Na", a rock number, was written six years ago. The rest of the six songs came about in the last two years before the release.[1] Other songs in the album include "Rain Bhai Kaari", a mix of Bengali Baul with rock and a tinge of S D Burman, and "Cineraria", a fun-filled English ballad. His latest song "Kabhi Aayine Pe Likha Tujhe" from the movie Hate Story 2 is well received by the audience and is also among the top 10 chart busters.