Watch Ariana Grande Dupe Robert De Niro & Ben Stiller With ‘the Worst Lie’ About Her Childhood

Ariana Grande impressed Robert De Niro, Ben Stiller, and Jimmy Fallon with her performance in "Focker-in-Law," but her claim of accidentally falling into a huge fish tank at her childhood aquarium remains a mystery. While visiting The Tonight Show Starring Jimmy Fallon, Ariana Grande participated in a game of "True Confessions" with De Niro, Stiller, and Fallon.

She recounted a false memory, claiming she was only four years old when she saw her older brother, Frankie, scuba diving in the tank. Despite the doubts from her castmates, De Niro, Stiller, and Fallon all believed her story. Ariana later admitted that it was her "worst lie" and expressed her gratitude for being invited to join the cast of "Meet the Parents," describing it as a surreal experience.