In an honest and at time hilarious post on Instagram, the Veronica Mars actress, 38, honoured her husband's incredible achievement, describing him as an "inspiration".
"To the man mocked me in our wedding photos because I cried too many tears of joy, Who wore a baby Bjorn for 2 straight years to show his girls how to be as adventurous as possible, Who held our dear little shakey mann pup for 8 hrs straight on the day we had to put him down, I know how much you loved using," she wrote.
"I know how much it got in your way. And I know, because I saw, how hard you worked to live without it," she continued.
"I will forever be in awe of your dedication, and the level of fierce moral inventory you perform on yourself, like an emotional surgery, every single night."
The couple, who share daughters Lincoln, five, and Delta, three, continued, "You never fail to make amends, or say sorry when its needed. You are always available to guide me, and all of our friends, with open ears and tough love when its needed most."
Describing her husband of almost five years the “the fertilizer in the garden of our life,” Bell praised Shepard for sharing his story "with the hope it might inspire someone else to become the best version of themselves".
"You have certainly inspired me to do so," she added, before concluding, "I love you more than I ever thought I could love anyone, and I want you to know, I see you. I see how hard you work. You set an excellent example of being human."
The actor has opened up about his past struggles with addiction on multiple occasions, in 2012 he told Playboy how Bell struggled to cope with his wild lifestyle.
"I just loved to get f—ed-up—drinking, cocaine, opiates, marijuana, diet pills, pain pills, everything. Mostly my love was Jack Daniel's and cocaine," Shepard recalled. "I lived for going down the rabbit hole of meeting weird people. Of course, come Monday I would be tallying up all the different situations, and each one was progressively more dangerous. I got lucky in that I didn’t go to jail."
Shepard says when he met Bell, the two couldn't have been more opposite.
"Kristen's a good girl. She grew up very Christian, went straight to college, did great in school and started work immediately. She's charitable and philanthropic and rescues dogs. So when we met, our backgrounds were opposites," he continued.
"All the things I'd done were terrifying to her, and she had a hard time believing I would ever be able to stay married and monogamous and a father and all those things. For the first year and a half, we were together that was what we battled over almost weekly."