Mumbai%2C 18th%C2%A0March 2023 %28NewsHelpline%29 %26%238211%3B Filmmaker Karan Johar pens a heartfelt note for his mother Hiroo Johar on her 80th birthday. %C2%A0 Sharing a string of pictures from birthday celebration%2C Karan penned a sweet note%2C%26%238230%3B