Singer-songwriter Billie Eilish is mourning the death of her dog Pepper.

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"My life long best friend. i will see you again someday sweet girl. you made it 15 years you [expletive] beast. :') i love you. rest easy mama, i'll miss you forever. this is a really hard day," the 21-year-old music artist captioned a photo of her snuggling her dog Sunday.

Other pictures in the gallery showed Pepper being loved by Eilish, her 25-year-old brother Finneas and their parents through the years.

The post has gotten nearly 6 million "likes."

Demi Lovato and Karissa Lopez both commented, "I'm so sorry."