Filmmaker Karan Johar on Thursday hosted a party for American singer Katy Perry, who will perform at an upcoming music concert in Mumbai. For the event, Katy opted for a purple golden gown and accessorised her look with heart-shaped earrings. Bollywood celebrities including Kajol, Alia Bhatt, Jacqueline Fernandez, Vicky Kaushal and Aishwarya Rai attended the party at Johar's residence.