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Kaley Cuoco, Instagram

Instagram

Today is, without a doubt, a very difficult day for Kaley Cuoco.

The Big Bang Theory actress took to Instagram to reveal that her childhood dog, Petey, passed away on what would've been her wedding anniversary to ex-husband Ryan Sweeting.

"Anyone who knows me, knows Petey. He was basically the first dog I ever had…I was gifted him on my sweet 16, by my bf at the time…I was afraid I would get into trouble so I hid him in my bedroom for 3 days until my parents found out," she began her heartfelt message alongside a sweet collage of the two over the years.

"They said I had to take care of him if I was to keep him, that he would be mine! I was so excited!! When I moved out of my parents' house at 17, I had plans to take him with me but he had stolen my parents' hearts and they wouldn't let me! Here we are 15 years later."

Cuoco added, "My folks gave him the greatest life and he taught us what it meant to love an adoption pup. I have since named my corporation after him (peteypie inc) and he has brought a lifetime of joy and laughs to our entire family. I know he will now enjoy doggie heaven where there will be an abundance of greenies just for him. This little guy, I will never ever forget..."

This year hasn't been without a few major hurdles for the blonde star. Back in September, it was revealed that she and Sweeting were divorcing after just 21 months of marriage.

Here's to 2016 being a bit kinder to the beloved TV star!