After posting an endearing post on his wifey’s birthday and saying ‘Tum aayi aur duniya badal gayi meri,’ Ayushmann Khurrana then celebrated his childhood sweetheart's birthday in the most special way, thanks to his Dream Girl co-star Nushrat Bharucha and Bala co-star Yami Gautam who gave a little sneak peek into her b’day bash