A four-time MLA, Lovely was first elected to the Delhi Legislative Assembly in 1998.
Lovely had joined the BJP in April previous year, who had raked up allegations of bribery in ticket distribution for the MCD polls by the Congress and asserted after meeting chief Amit Shah that many senior Congress leaders were feeling "suffocated" as the party is no longer what it was used to be.
Earlier in the day, Lovely met Gandhi at his residence here along with Delhi Congress chief Ajay Maken, former Delhi Minister Haroon Yusuf and party's spokesperson Randeep Singh Surjewala.
Lovely had joined the BJP nine months ago.
Speaking at a press conference after his re-entry, Lovely said his decision to leave the party and join BJP was taken at a moment of emotional weakness.
Maken, for his part, confessed that he had made mistakes as the PCC President leaving room for improvements while communicating with party colleagues.
Singh held important portfolios such as education, tourism, urban development and transport as a minister.
He was re-elected for the fourth time into the assembly in 2013 from Gandhi Nagar constituency. Upon hearing the news, Maken had broken down in tears as he struggled to control his emotions. Somebody who lost his election deposit in 2015, was foisted on the party, he had said.
He was welcomed back into the party by AICC incharge of Delhi unit PC Chacko along with Maken.
In April previous year, Lovely had quit the party after alleging that the ticket distribution process for the MCD elections was plagued with bribery. Arvinder Singh Lovely had left the Congress party back in April after he alleged that Congress was getting involved in bribery during the ticket distribution for the MCD polls. He did not contest the 2015 elections when AAP won a brute majority.