Watch full movie online. Happy Birthday (Sinhala: හැපි බර්ත් ඩේ) is a 2022 Sri Lankan Sinhala action mystery thriller film directed by Aruna Jayawardena and produced by The Capital Maharaja Organization Limited as a Stein Film, and distributed by M Entertainments. The film stars Dilhani Ekanayake and Isuru Lokuhettiarachchi in lead roles whereas Tashi Kalidasa, Yohani Hettiarachchi, Surya Dayaruwan and Randika Goonetileke made supportive roles.