2.19M accounts from i-Dressup (i-dressup.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In June 2016, the teen social site known as i-Dressup was hacked and over 2 million user accounts were exposed. At the time the hack was reported, the i-Dressup operators were not contactable and the underlying SQL injection flaw remained open, allegedly exposing a total of 5.5 million accounts. The breach included email addresses and passwords stored in plain text.
Source: Have I Been Pwned (CC BY 4.0)