Yes, Priyanka refused to kiss Harman in the film though the latter was keen on locking lips. Priyanka revealed that she wouldn't do certain things on screen irrespective of the co-star. Harman also admitted that Priyanka objected to the kissing scene in Love Story 2050 though he and his dad wanted one. He added that he respected her decision.
[an error occurred while processing this directive] But the big question is why Priyanka refused to kiss Harman when she had earlier kissed her co-star in the film Andaaz. May be the actress is not sure of Harman!