AceShowbiz - Farrah Abraham's late boyfriend, Derek Underwood, would have turned 29 on Wednesday, May 8. Marking the occasion, the former "Teen Mom OG" star posted an emotional tribute to her late baby daddy along with a slew of photos from their high school days.

"You gave me that once in a lifetime love of my life everyone so deserves," she said on the photo-sharing platform. "You gave me so many 1st's, from virginity, proms trips, my first ring, you showed me unconditional love, you showed me what relationships are, from prom, graduation, to our only child."

Farrah continued, "All the events that had happened the entire sequences was one filled with the thrill, love & loss. Now I share a birthday breakfast in your memory & all our best photos and your childhood photos with our daughter." She went on thanking Derek for "being the loving man I know," and recalled "all the memories we had."

Concluding the post, the "Ex on the Beach Club" star wrote, "My partner in crime getting me in all the trouble love you legend we all miss you today more than ever & so much love, memories from Sophia & I, family, friends and those who watched over the years, Happy Birthday I love & miss you, and thank you for everything you did to me."

Besides photos of their time together, Farrah also included a video of her daughter, Sophia, looking at pictures of Derek.

Derek was killed in a car accident on December 28, 2008, two months before Farrah gave birth to their daughter. Even though the two weren't on good terms at the time of his death, the reality TV star shared in her book that he was "my first love, my only true love." She also revealed in a 2013 interview that she would have married Derek if he's alive.