In the latest issue of Injustice 2, the prequel comic for the Injustice video game, DC confirmed that Harley Quinn and Poison Ivy are married.
Dr. Pamela Isley and Dr. Harleen Quinzel have been partners in crime, and perhaps more, since their first appearance together in Batman: The Animated Series. That episode, Harley and Ivy, premiered back in 1993.
Since then, many in the Batman fandom have shipped Harley and Ivy as a romantic couple. In fact, it was always the intention of Batman writer Paul Dini and director Bruce Timm that the two are more than friends. Hints about this ‘special relationship’ began appearing in the comics in 1999, when Harley became a permanent DC character. In 2015, without the censorship of Fox Kids, the two were finally able to be open about that romance.