Poor Farrah Abraham.

The Teen Mom OG star paid homage to her late ex-boyfriend, Derek Underwood on Twitter after a fan tagged her in this gorgeous collage.

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"@F1abraham this melt my heart," the user wrote alongside a sad emoji.

https://twitter.com/CarolinaLeiva79/status/795810099411423232

Farrah replied with, "Love this."

Derek is the father of the MTV star's daughter, Sophia, but was tragically killed in a car accident before she was born. He is survived by his family — who we sometimes see on the TV show, and Farrah also makes it a point to take her seven-year-old to visit his grave.

Find out more about the Teen Mom baby daddies in the gallery!