This article considers the double role of child prodigies as child stars and psychological subjects in Paris in the Belle Époque. I argue that the celebrity status of child prodigies during this time contributed to their transformation into objects of scientific curiosity. The notions of innate talent and natural-born genius contributed heavily to stories of child prodigies within the public sphere; these stories also circulated in psychological accounts of such children. To illustrate this, I examine the case of Pepito Arriola, the so-called Spanish Mozart, in more detail. This musical prodigy toured Europe and America during the early 20th century, and when he was 3- and one-half years old, Charles Richet presented him at the Fourth International Psychology Congress (1900) in Paris. Arriola became the first virtuoso to be submitted to psychological examination, and he was subsequently examined in Berlin by the psychologist Carl Stumpf. This closer look at Pepito Arriola’s case clarifies how popular culture and scientific research interacted in the making of a prodigy. (PsycInfo Database Record (c) 2021 APA, all rights reserved)