Filmmaker and producer Karan Johar twins, Yash and Roohi turned four on Sunday. Karan hosted a birthday bash for the kids. Many popular celebrities and their children attended the party. Kareena Kapoor Khan with son Taimur, Neha Dhupia with daughter Mehr, Gauri Khan and son AbRam Khan, Tusshar Kapoor with his son Laksshya and Ekta Kapoor with her son were snapped at Karan's residence. Later in the evening, Rani Mukherjee was also seen with daughter Adira.