"Dancing with Shahid is very difficult. I used to get so nervous. I think, Shahid is very quick while dancing. It was difficult to match steps with him," Ileana told reporters in a group interview.
Shahid is considered as one of the best male dancers in Bollywood and the two will be seen together for the first time in Rajkumar Santoshi's film that is set to release Friday.
The actress, who is a known name in South industry, debuted in Bollywood with "Barfi" and says that unlike in South, one needs to be fit in Bollywood.
"There is some difference (between Bollywood and southern films) but it also depends from director to director. I have to be fit here unlike in South. I am very conscious about my looks. In South, actresses need to be a bit healthy but here I will have to be fit," she said.