Lovely, who shares same name as DPCC chief Arvinder Singh Lovely, had won Assembly elections from Deoli constituency in 2008.
Sources said that he was upset as Congress had decided not to give him ticket for upcoming assembly polls. He was defeated by Aam Aadmi Party in 2013 Assembly elections.
"I was impressed by Prime Minister Narendra Modi following which I am today joining the BJP," Lovely told reporters here.
"I was very disappointed as my father was denied a ticket by Congress in the General elections following which he had to contest elections independently in Rajasthan. I will now assist the party to win the upcoming assembly elections."
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According to the BJP, Lovely has worked within the SC community and will therefore strengthen the party.
"With the joining of Lovely, it will definitely strengthen the party in the forthcoming polls. We are very confident that BJP will form a government with full majority," Delhi BJP chief Satish Upadhyay said.
Two AAP leaders Sandeep Dubey, an advocate and engieer Chandrakant Tyagi also joined the saffron party.
Attacking Arvind Kejriwal-led Aam Aadmi Party, Sandeep Dubey said that the voice of common man is not heard in AAP that's why he has joined BJP.