Actor Radha Ravi and actress Namitha joined the BJP here in the presence of its national working president J P Nadda, the party said on Saturday.
Radha Ravi, a former AIADMK MLA, had quit the DMK in March this year after he was suspended for indiscipline and joined the ruling party again.
Son of iconic yesteryear actor and a stalwart of the Dravidian movement, 'Nadigavel,' M R Radha, Ravi had often switched loyalties between the main opposition DMK and the ruling party.
Known for his controversial remarks on a number of issues, he was suspended from the DMK for an alleged sexist remark against actress Nayanthara.
A popular Tamil and Telugu actress, Namitha had joined the AIADMK in the presence of former Chief Minister late J Jayalalithaa in early 2016.
BJP national general secretary P Muralidhar Rao tweeted: "BJP is the future of South Indian Politics. Famous actress Namitha and actor Radha Ravi joined BJP in presence of BJP National Working President Shri @JPNadda ji in Chennai.
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