This study examined day-to-day mood changes associated with disclosure of positive and stressful events as affect regulation within couples. In daily diaries, 48 couples cohabiting in the United States reported whether they told their partner about the most positive and stressful event of their day. Participants reported greater positive affect on days when they told their partner about the most positive event of their day. This effect was less pronounced among avoidant women. Participants also reported greater positive affect on days when their partner shared their most positive event. Sharing about stressors was not associated with greater negative affect. These findings underscore the importance of investigating affect regulation processes such as daily event disclosures from a dyadic perspective.