"Happy birthday Jeetendra .. urf Jeetu," Amitabh tweeted.
Amitabh and Jeetendra have worked together in "Gehri Chaal" in 1973.
The two also made a cameo appearance in Farah Khan's 2007 directorial "Om Shanti Om" starring superstar Shah Rukh Khan and actress Deepika Padukone.
On the work front, Big B is currently shooting for Shoojit Sircar's thriller "Pink", where he will reportedly be seen playing the role of a lawyer. The film also stars two-films-old actress Taapsee Pannu.
The "Wazir" star will also be seen in Sujoy Ghosh's production venture "TE3N", which also stars Vidya Balan and Nawazuddin Siddiqui. (IANS)