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Romantic relationship experiences have been found to be relevant to body image and weight in adulthood. In this study, we investigated predictors of heterosexual, lesbian, and gay romantic partners' ( N = 500, M age = 29.3) perceptions of their own and their partners' weight at the beginning of their relationship and 4.8 years later, on average. Perceived changes in participants' own weight status was associated with greater body dissastisfaction and longer relationship length. Perceived changes in partners' weight status was associated with their partners' BMI, as well as relationship quality. We also found that gender was important in understanding some of these associations. Implications of weight perceptions for individuals' and their partners' health and well-being and the critical role of relationship quality are discussed in the context of the health regulation model., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Markey, August, Kelly and Dunaev.)