The ruling AIADMK on Sunday formed an alliance with DMDK led by actor-turned-politician Vijayakanth, allotting four Lok Sabha seats in Tamil Nadu, ending protracted negotiations.

The agreement was signed between the top leadership of both parties in Chennai in the presence of Tamil Nadu Chief Minister K Palaniswami along with his deputy O Panneerselvam and Vijayakanth and DMDK Treasurer and wife Premalatha.

Panneerselvam, the coordinator of the ruling party, told the reporters that it was a committed alliance.

Premalatha pledged her party's support to the AIADMK in the bypolls to 18 assembly seats and local body elections, expected in May.

AIADMK has already finalized seat sharing with BJP and PMK and a few smaller outfits for the Lok Sabha elections.

It has allotted seven seats to PMK, five to the BJP in the state and the lone Puducherry seat to AINRC.