The 30-year-old actor took to micro-blogging website Twitter on Tuesday to share the news.
A romantic comedy, the plot reportedly revolves around a single mother and her daughter falling in love with the same man.
Shimla Mirchi also co-stars veteran actress Hema Malini and Rakul Preet Singh.
Meanwhile, Rajkummar will next be seen in Mohit Suri's forthcoming film Hamari Adhuri Kahani, which also features actor Emraan Hashmi and actress Vidya Balan in key roles.
Produced by Vishesh Films and presented by Fox Star Studios, Hamari Adhuri Kahani releases on June 12.