Demi Lovato paid tribute to her late dog Buddy with a touching video.

Demi Lovato

Demi Lovato

The 23-year-old singer lost her pet in July when he was killed by coyotes, and marked five months since his passing with an emotive post on Instagram.

Alongside a video of herself with Buddy, Demi wrote: "One year ago today, God blessed me with the sweetest little angel and my very first son. Words will never be able to express my love and bond with him.

"I felt like he was literally my baby because the connection I had with this little guy was scarily human. I believe he came into my life at the perfect time but he left way too soon and a piece of my heart will always be broken without him in this world."

Demi added that despite Buddy's death, the pooch will always be part of her life.

She continued: "I love you so much Buddy and I miss you every single minute of every single day but you'll live on in my heart with memories like this forever ... RIP my little baby boy and angel. I love you my little lion heart. Your light is inside of me."

Demi is currently on holiday in St. Barts with boyfriend Wilmer Valderrama.

Earlier this week, she was seen showing off her svelte figure in a plunging black swimsuit as she splashed in the sea with her former 'That 70's Show' star beau.

The pair were seen attempting to recreate the famous lift from 1987 movie 'Dirty Dancing', but ended up collapsing in hysterics after it went wrong.

Demi also told fans that her romantic break was being somewhat ruined by the infestation of mosquitos.

Demi wrote on her Twitter page: "I've become so sensitive over killing bugs lately, but I'm about to go ID channel on these island mosquitos right now."