The "Wrecking Ball" singer reunited with the Australian star last year and reports suggest the couple's wedding plans are back on.
Her father previously confirmed Miley and Liam are back together, and now he said he's a big fan of his daughter's partner - because he makes his little girl smile, reported In Touch magazine.
"I love that she and Liam are so happy right now. Happy is hard to find. So if you're in a good spot, woo! Bam! And Miley knows that. Seeing her happy is the greatest thing ever," Billy, 54, said.
While the couple has yet to confirm if its wedding plans are officially back on, sources claim the pair is currently ironing out details.