Lovely, who shares same name as DPCC chief Arvinder Singh Lovely, had won Assembly elections from Deoli constituency in 2008.
"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."
Lovely's father Buta Singh, who served as the Union agriculture minister in the Rajiv Gandhi cabinet at the Centre between 1984 and 1986, was elected to Lok Sabha eight times between 1962 and 2004. He was the home minister between 1986 and 1989.
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.
Apart from that, BJP claimed that Rashtriya Lokdal's councilor Anita Tyagi (Chhatarpur), former Congress councilor Deepak Choudhary, DPCC's secretary Shashikant Diskhit, and Congress leader Gopal Pahariya were among the leaders who joined the BJP.
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.