Kalki Koelchin, who will appear with Prateik Babbar in My Friend Pinto, finds her co-star very spontaneous and humble.Koelchin and Babbar, who modelled for designer Rina Dhaka on the first day of the Wills Lifestyle Fashion Week (WIFW) on Saturday, walked confidently and totally in sync on the ramp.\"Prateik is very spontaneous and humble. He always instructs and supports me whenever I get nervous, so this chemistry worked on ramp as well,\" Koelchin said after the show.In the first half, Koelchin wore a fish-cut gown with minimal accessories, while Babbar shed his shy demeanour to flaunt his six-pack abs in a lycra shirt with the buttons wide open, and a pair of cotton trousers.Koelchin then sported a flowing off-the-shoulder gown with an asymmetrical hemline, and Babbar wore a beige chiffon shirt with a pair of printed trousers.