An Emotional Selena Gomez Pays Tribute to Christina Grimmie During Miami Concert

"I don't really understand how this really happened," the singer said.

Gomez then proceeded to perform a heartfelt rendition of her song "Transfiguration."

Gomez, 23, also reportedly cancelled a meet-and-greet with fans in Miami following Grimmie's death.

Earlier in the day, Gomez posted a photo of herself hamming it up with Grimmie, writing, "My heart is absolutely broken. I miss you Christina."