Apparently it is Kangna's new character, which also resembles the popular Disney character - that has caught Sush's wild imagination and she named her new-found buddy Minnie Mouse.
In response, Kangna shared her mutual feelings for Sush on her blog too: "I've been shooting for Anees Bazmi's 'No Problem', and had a great time on the sets with Sushmita, Akshaye and Sanjay. I enjoyed spending girl-time with Sushmita, who nicknamed me 'Minnie Mouse' because of my hairdo for the role I play, which has bangs and two pony tails...and probably because I wore a lot of pink...and she thought it looked so cute. It was fun to hang out with someone so chilled out."
So, it's a girls' day out, afterall!