Kristen Bell shares how her daughter marked Dax Shepard's 'sobriety birthday'

It's been 15 years since Dax Shepard committed to a sober lifestyle and his daughter marked that milestone in the sweetest way on Tuesday.

Actress Kristen Bell shared the adorable card and illustration one of her daughters made, explaining, "Today is my husband's 15th sobriety birthday. My daughter woke him up with this sign, and a sketch of the one and only Ronald Weasley(absolutely random, and also perfect)."

The card, written on a plain piece of copy paper, had "Happy sobriety birthday [daddy,]" written in red marker. There was also an accompanying illustration of Ron Weasley from the "Harry Potter" series.

The gesture meant the world to both parents as Bell gushed, "Happy birthday Daxy. Thank you for dedicating your life to the hard and wonderful work of sobriety, so that we could share it with you."

Shepard and Bell are parents to daughters Lincoln, 7, and Delta, 5.

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Actresses Octavia Spencer, Mandy Moore and Mindy Kaling cheered on Shepard, with the latter expressing in the comments section, "Wow, this is so awesome."

Shepard has been upfront over the years regarding his recovery from alcohol and drug addiction and frequently speaks about his past experiences.

In an episode of his podcast Armchair Expert, which he recorded last week with actor Rob Lowe -- who recently marked being 30-years sober -- the "Bless This Mess" star admitted that he doesn't regret his past experiences.

He also shared that when his daughters come of age he would be open to them experimenting with marijuana and magic mushrooms. He, however, drew the line at harder substances: "Just don’t do cocaine or opiates."