Karan Johar, Akash Ambani, Ayan Mukherji, and others attend Ranbir Kapoor's birthday bash

Ranbir Kapoor, who is enjoying Brahmastra`s success at the box office turned 40 on September 28. The paparazzi caught numerous celebrities driving up to his Mumbai home the day before his birthday. Leading Bollywood figures like Karan Johar and Ayan Mukerji visited him to wish the actor a happy birthday. Karan Johar wore a black hoodie with fashionable eyewear to complete his look. Whereas, Ayan Mukerji, who directed Brahmastra starring Ranbir and Alia Bhatt donned a t-shirt and a shirt