Kristen Bell has praised her husband Dax Shepard for his ''dedication'', as he celebrates 14 years of sobriety.

The 38-year-old actress has two daughters, Lincoln, five, and Delta, three, with the 'CHiPS' star - whom she married in 2013 - and in a moving letter posted to Instagram on Saturday (01.09.18), the star paid tribute to her husband's continued sobriety.

Posting a series of pictures of Dax, Kristen wrote: ''To the man mocked me when 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. I know how much it got in your way. And I know, because I saw, how hard you worked to live without it.

''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. (sic)

The 'Frozen' actress went on to dub Dax, 43, as an ''inspiration'' to her.

She 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.

''You have become the fertilizer in the garden of our life, encouraging everyone to grow.

''I'm so proud that you have never been ashamed of your story, but instead shared it widely, with the hope it might inspire someone else to become the best version of themselves.

''You have certainly inspired me to do so. (sic)''

Kristen rounded off her message by saying Dax is an ''excellent example of being human''.

She said: ''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.

''Happy 14th year sobriety birthday, @daxshepard.

''Xoxo (sic)''