Radio City 91.1FM, which airs the show, has revamped the show's strategy with a fresh jingle.
"Radio City's flagship show ‘Love Guru' has been an integral part in every lovers journey and I am extremely happy to join this celebration as the show crosses a mark of 15 years," Ranbir said in a statement.
"I would like to congratulate the radio channel for this longest running show and my best wishes to this confidante, friend, philosopher and guide -- Love Guru," added the actor.
Kartik Kalla, EVP and National Head, Programming, Marketing and Audacity, Radio City said: "Love Guru is India's oldest love counsellor and has become a cult brand on radio. After a successful stint of 15 years as a late night show, we now reposition Love Guru as a complete package with a new jingle in the prime time band.
"We are introducing new segments in the show and are certain that this revamp strategy will work wonders in this new time band for us," Kartik said.
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(With IANS Inputs)