The 'Queen' star features in a small role in the film which stars Ranbir Kapoor, Anushka Sharma and Aishwarya Rai Bachchan.
"I don't know how much I am allowed to say, but that was the most fun I've ever had with a character. We have ten more days left at the end of July to finish up shooting. It was a really fantastic experience," Lisa told PTI.
'Ae Dil Hai Mushkil' is a romantic-drama which also stars Fawad Khan. The film is scheduled to release this Diwali.
When asked if she will be sharing screen space with Ranbir, the 30-year-old actress said, "We have scenes together... I have got a small but a very interesting role. I got a great kick playing that character. I hope people will enjoy it too."
Lisa will soon be seen as a judge on the second season of MTV's 'India's Next Top Model'.