Haralambos (Babis) Tsertos (Greek: Μπάμπης Τσέρτος; born October 27, 1956) is the brother of the singer Nadia Karagianni. His father was a musician too, and he was playing the Mandolin. At the age of 17, he settled permanently in Athens and in 1974, he entered the Faculty of Physics at the National and Kapodistrian University of Athens.