In social psychology, “what is attractive is good” means that a physically attractive person is perceived to be more favorable and capable. In industrial design, the interface is one of the three elements that influence users’ experience with a product. For multimedia learning, does the interface design affect users’ experience with learning environments? Does attractive interface enhance multimedia learning? Research in multimedia learning has been neglecting this issue. In this chapter, I propose that attractive interface design does indeed promote multimedia learning. This hypothesis is based on the review of the following theories and related empirical studies: 1) an interface impacts a user’s experience; 2) beautiful interface induces positive emotions; 3) positive emotions broaden cognitive resources; and 4) expanded cognitive resources promote learning. The Model of Emotional Design in Multimedia Learning is proposed to highlight how emotions regulate multimedia learning. Suggestions regarding designing attractive interfaces are provided.