Karan Johar treated his twins - son Yash and daughter Roohi - to an early birthday party on Wednesday evening. Yash and Roohi will turn three on February 7. Early guests at the birthday party, held at Mumbai's Taj Lands End, include Kareena Kapoor, Soha Ali Khan, Ritiesh Deshmukh, Tusshar Kapoor, Ekta Kapoor and Alia Bhatt.