• Dax Shepard shared a cowgirl photo of his wife Kristen Bell on her birthday
  • Shepard accompanied Bell's adorable photo with a sweet caption
  • Several of Shepard's followers wrote sweet birthday messages for Bell on Instagram

Dax Shepard made his wife Kristen Bell's birthday extra special with a sweet tribute on social media.

The 46-year-old actor took to Instagram and marked Bell's 41st birthday by sharing an adorable photo of "The Good Place" star. In the snap, she is wearing a cowgirl hat, black shirt, a denim jumper and black boots while sitting on what appears to be a wooden table.

"Happy Birthday Cowgirl," Shepard wrote in the caption. "Your beauty is only surpassed by your heart and buns. Here’s wishing you another 100 years in the saddle. [five red heart emoji] @kristenanniebell."

Shepard's post for his wife received numerous comments, as his followers sent his wife their love and birthday greetings.

"Happy Birthday, KB," Rutledge Wood commented.

"Happy Birthday, gorgeous!" Mary Steenburgen wrote.

"My birthday twin is better than yours! happy birthday beautiful," another added.

"Happy birthday Kristen!!! She look so adorable!" a fourth netizen stated.

"Happy Birthday, Kristen! thank you for being an inspiration and a much needed light in this world!" a fifth user wrote.

Shepard is fond of sharing photos of his wife on social media. He has also shared Bell's nudes online several times before.

Last month, he shared a snap of the "Frozen" voice actor on Instagram. Bell was seen wearing nothing while sitting on her knees on the sand. The photo had a text written on it that read, "Dear Rick, you have the best bus in the business."

"For @rickglassman, but let’s be honest, mostly for @kristenanniebell," Shepard wrote in the caption.

The post received many comments and several of them praised the couple's relationship. One even pointed out the number of times Shepard shared the nudes of his wife on social media.

"The second naked picture you’ve posted of your wife in about a month LMAO," one commented.

"You 2 are both freaking awesome - but no lie she is pure perfection," another wrote.

The "Armchair Expert" host also shared another nude photo of Bell on Mother's Day. She was seen doing the three-legged downward-facing dog pose wearing nothing but socks while under the sun in the photo. Shepard placed a red box to cover her behind and accompanied it with a sweet caption.

"Mom’ing has changed since I was a kid...and I’m here for it," he wrote on Instagram. "Look at this specimen: kind, patient, nurturing, hilarious, Uber talented, generous, hard AND soft. My girls and I hit the MegaMom Lottery in spectacular fashion. We are so grateful and so in love with you @kristenanniebell."

Dax Shepard, Kristen Bell
In photo, Kristen Bell and Dax Shepard arrive at the 74th annual Golden Globe Awards, January 8, 2017, at the Beverly Hilton Hotel in Beverly Hills, California. Getty Images/Valerie Macon