Tori Roloff posts a heartfelt message celebrating sister-in-law's birthday

Tori Roloff left a heartfelt message for Audrey on her special day.

Tori, 27, took to Instagram recently to share a photo of herself and her sister-in-law Audrey.

The Little People, Big World star captioned the post: "Happy birthday to this ruby! Having you as a sister in law is such a gift and I admire your constant pursuit of Jesus and how hard of a worker you are."

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"Your want to help others around you is infectious and your zest for life is contagious. Love you sister. Happy birthday!" she added.

In the photo, Tori and Audrey can be seen standing back to back in a wooded area. They are both sporting a sweatshirt from Audrey’s “Always More” clothing line.

Tori sports a straight hair 'do while Audrey styled her hair down and curled.

The two women both wear a pair of leggings. Tori rocks a pair of sneakers and Audrey dons a pair of boots.

Since the photo was posted, it has been liked more than 49,000 times. Many of Tori's followers also placed their thoughts via comments.

Instagram user @ketta2014 wrote: "Great to see sister in laws that are so close and happy to be together. It is very rare in today’s world."

"I love both of you! You are each amazing and inspiring women," user @theoilynana added.

"Happy Birthday!! Good Luck! We will miss u on the show but God is calling you for bigger and better things! God Bless you and your family on your new adventures!!" commented @ginaluisidestefano.

"Happy Birthday Audrey. I love you both. You both are so sweet and loving. Oh and you both are gorgeous," Instagram user @foxbokal chimed in.

Tori has been married to Zachary Roloff since July 25, 2015. The couple recently revealed that they have a few big projects coming up, including a book, according to Inquisitr.