Always in her heart.

Married at First Sight's Jamie Otis took to Instagram on Thursday, July 12, to pay tribute to her late son, Johnathan, who she and her husband, Doug Hehner, lost one year ago.

“A year ago today was one of the most difficult, saddest days of my life … today is our angel baby’s heavenly birthday,” Jamie, 31, wrote.

View this post on Instagram

A year ago today was one of the most difficult, saddest days of my life … today is our angel baby's heavenly birthday.👼🏼 We wanted to remember him & honor him so we planted a beautiful tree front & center in our yard.🌲 Every day we can see it, watch it grow, and be reminded of him.💚 Thank you to all the ladies who helped us figure out how to correctly plant a tree on Facebook live last night (link in bio) …And thank you all for helping us love, honor, and remember our first born…. we think it turned out great.💙 He was only here with us for a short time, but he'll always be in our hearts! ….We will always love you sweet little Johnathan.👼🏼💚 Thanks for being a great big brother to your little sister. 👶🏼🌈 #pregnancyloss #infantloss #alwaysinourhearts ❤️

A post shared by Jamie Otis (@jamienotis) on

MORE: 'Married at First Sight' Spouse Drops the Dreaded F Bomb: "Let's Be Friends"

In her post, the reality TV starlet — who suffered a heartbreaking miscarriage last July, four months into her pregnancy — shared photos of the tree she and Doug, 36, planted in honor of their late son.

“We wanted to remember him & honor him so we planted a beautiful tree front & center in our yard,” Jamie continued. “Every day we can see it, watch it grow, and be reminded of him.”

The Bachelor alum — who is currently pregnant and expecting a little girl with Doug — concluded, “He was only here with us for a short time, but he’ll always be in our hearts! … We will always love you sweet little Johnathan. Thanks for being a great big brother to your little sister.”

View this post on Instagram

A year ago from today was our last full day pregnant with our first born son. Johnathan was delivered on July 13th, 2016 at just 17 weeks, 1 day. He was way too little to survive outside the womb.😢 I remember feeling so helpless – there was nothing I could do to help my baby.😥 I swore to myself, to my hubby, to God, to my baby boy, and to ANYONE who would listen that I'd never let him just be forgotten.🙏🏼 I blogged a lot to help cope with the loneliness; to numb the pain. I will forever be thankful & I'll never forget the countless Frans – and even strangers – who reached out to me to offer love & support.💗 …I planned ways to honor our angel baby's short, sweet life.👶🏼💙 One of the ways I wanted to remember him was by planting a tree for him & watching it grow. Now that we finally have our own home and our own backyard we can plant that tree. We researched and found a tree that blossoms all summer long.🌲 Tonight at 7 pm EST we are going to remember & love on our angel baby & we'd love for you to join us in keeping Johnny's memory alive.💚 We'll be live on Facebook at 7pm EST. Link to fb is in my bio. 👼🏼💙 #alwaysinourhearts #johnathanedward #angelbaby #bigbrother

A post shared by Jamie Otis (@jamienotis) on

MORE: Still Together? See Where All the 'Married At First Sight' Couples Are Now

As previously reported in February, Jamie revealed via Instagram that she was pregnant with baby No. 2. “We are PREGNANT!!! Our sweet Baby Hehner is due this August,” she wrote in the caption with the hashtags “#pregnant” and “#overjoyed.”

At the time, Jamie and Doug posed for a rainbow-themed photo shoot to celebrate their “rainbow baby” — a term used for children who are born to parents who have previously gone through a miscarriage. Jamie held up a sonogram while Doug proudly displayed a sign that read, “Handpicked for Earth by my brother in heaven.”

For access to all our exclusive celebrity videos and interviews – Subscribe on YouTube!