The 34-year-old actor posted a cute clip Wednesday on Instagram of himself and his children performing to Cyrus' song "Wrecking Ball." Cyrus is engaged to Hemsworth's brother Liam Hemsworth.
Hemsworth shares 6-year-old daughter India and 4-year-old twin sons Tristan and Sasha with his wife, actress Elsa Pataky. The video shows the actor dancing around the house with his kids and the family dog.
"What started as a ground breaking music video ended in a savage attack by a cowardly K9. Never work with Kids or Animals," he joked in the caption. "#wreckingball #wreckingdog #daddydaycare #murderonthedancefloor @mileycyrus @liamhemsworth."
Cyrus responded by re-posting the video with heart emojis in the caption. Hemsworth had described the 25-year-old singer as "a lot of fun" during an appearance on SiriusXM's Sway in the Morning in January.
"I always just expected her to put on a show and bang a few songs out but she never does," he said. "I'm insisting constantly. I'm like, 'When's the performance coming?' But she's just a lot of fun."
Hemsworth denied in the interview that Liam and Cyrus had wed in secret.
"They're not officially married," he said.