We examine the causal effect of peer information on mate choice within a field experiment conducted in a speed dating environment. Our novel contribution is the provision of popularity information to participants about their potential partners, generated directly from same-sex competitors. We find that our treatment motivates a substantial number of participants to reconsider their initial romantic interest, with the likelihood of being rejected increasing for more popular partners. We attribute these results to the heightened salience of competition, which counteracts the positive effect of social learning from peer information commonly reported in the literature. Analysing these decisions alongside survey data on participant characteristics reveals heterogeneity in the treatment effect. We explore some potential mechanisms to explain our results.