Amitabh Bachchan's grandson, Agastya Nanda, celebrated his birthday while actively promoting his debut film, The Archies. Agastya's co-star in The Archies, Mihir Ahuja, posted a video of Agastya cutting his cake with Suhana Khan at his side while a chorus of well-wishers sung the birthday song on Instagram, giving fans a peek of the celebration.