The 33-year-old actor is looking forward to start shooting for the movie, in which he is paired opposite the "Ae Dil Hai Mushkil" star.
Produced by Rakeysh Omprakash Mehra, the film also features Anil Kapoor and Divya Dutta.
"I have started shooting for the film but I am yet to shoot with her (Aishwarya), though we have had our workshops and reading sessions.
"There is a love angle between us. I am looking forward to it, though I am nervous and excited because you have to romance the world's most beautiful woman," Rajkummar added, and quipped, "But it will come naturally, I am sure."
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He was speaking at the trailer launch of his latest, "Shaadi Mein Zaroor Aana" here last evening.
Like his previous films such as "Queen", "Behen Hogi Teri" and "Bareilly Ki Barfi", the upcoming film also has marriage as the backdrop.
Asked about his take on arranged marriage, the 33-year- old actor said, "I totally believe in arranged marriage, I think each to their own. My parents had an arranged marriage and they remained happy.
"Sure, there should be freedom, no one should be forced into an arranged marriage. Everybody has the freedom to choose their own partners."
Also starring Kriti Kharbanda, "Shaadi Mein Zaroor Aana" is scheduled to release on November 10.