The 21-year-old model said she is proud of the former "One Direction" singer.
"Z - I've seen the battles you go through and the way you fight to get to a place that allows you to get up there for your fans. Your bravery in those times makes me proud, but your honesty last night proved what you're all about, being real. Human recognizes human. You made the best of the situation and have given your fans an opportunity to understand you better as a performer," Hadid wrote.
Zayn, 23, and Hadid had a brief break up, but were spotted holding hands in New York City a week later.
