EXCLUSIVE: Billy Ray Cyrus Reveals Liam Hemsworth's Passion for Painting: 'He's a Great Artist'

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Billy Ray Cyrus can't stop raving about Liam Hemsworth.

The 55-year-old singer sat down with ET's Nancy O'Dell in honor of the 25th anniversary of "Achy Breaky Heart" in Los Angeles on Monday, where he opened up about daughter Miley's boyfriend -- and his secret passion for painting.

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"Liam is a great guy. I like his heart. He's got a great spirit about him," Cyrus shared. "I'll tell you something you don't know about him though: he's a great artist."

"He's a painter," he added of Hemsworth, who is also credited for photographing the cover art for Miley's latest single, "Malibu."

"[I had never seen his art], then all of a sudden, I go into this room and there's, like, 1,500 paintings up of, like, these things, and I'm like, 'Who did this stuff?'" the father of six recalled. "Liam paints them. I go, 'Liam, when is your next art show?' And he's very humble about it."

Hemsworth is so humble, in fact, that Cyrus says the actor keeps his hobby hush-hush. 

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"I don't know [how you] don't ever tell anybody. I'm like, 'Dude, what are you talking [about]?' He's got painting after painting, that's just incredible stuff," he said. "He's a painter. Who knew?"

While Hemsworth kept this passion from Cyrus, the singer says the two have started to bond more over the last few months.

"We have been hanging out more in the last couple of months than the last couple of years," he explained. "It's been a really great time period. There is something full circle, if you will, maybe about our family and our lives and looking at it now and saying, 'Wow OK, what actually happened here?'"

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Cyrus recently found himself shutting down rumors that Hemsworth and his daughter got married. 

See more in the video below.