Shamim Manan and Jay Soni
Says a source from the sets, "The show requires the protagonists share an equation like Shah Rukh Khan and Kajol did in Dilwale Dulhaniya Le Jayenge. Jay has taken it too seriously, and he tries to create a good equation with her in real life too. He teases Shamim with different names to develop a certain comfort level with her. One of these names being Senorita Isabella which means Miss beautiful in Spanish. They also indulge in some fun banter between themselves."
When contacted, Jay justifies it saying, "I believe that as co-actors you need to share a very strong comfort level off-screen too, if you want to create the magic on-screen. I love DDLJ and while we were shooting in US, it reminded me of all the beautiful and dream-like moments between Raj and Simran as even that was an outdoor shoot in Zurich. I keep teasing Shamim, which I believe it'll only help us enhance our characters and chemistry on-screen."
http://screen.indianexpress.com/news/jay-soni-the-perfectionist-/1070958