ET caught up with the 41-year-old Spanish actress at the New York City premiere of her latest movie, 12 Strong, on Tuesday night, where she gushed about her future sister-in-law.
"We love it because she's just so creative. So any moment, on any circumstance, she actually just writes a song, so we love her and having her around is fun," Pataky explained. "[We'll say], 'Just sing us something,' and she does."
"She's amazing and my kids love her, and she has an amazing voice," the mom of three added.
Earlier in the day, Pataky's husband and 12 Strong co-star, Chris Hemsworth, was on SiriusXM Studios' Sway in the Morning, where he said that he always expecting the "Malibu" singer -- who's engaged to his younger brother, Liam Hemsworth -- to "belt out a few songs" while they're all hanging out, but said "she never does." Apparently, he needs to listen closer when Pataky and Cyrus hang out!
Pataky and Cyrus actually have a very close relationship -- the two even have a matching wave tattoos that they got in 2016. And did you know that the blonde beauty also has matching ink with another best pal, Luciana Barroso -- aka Matt Damon's wife?
"Just three points, it's simple," Pataky told ET earlier in the day. "It's three dots that means today, tomorrow and forever. It's to remember moments. ...When I have a great moment with people that I love, it's good to remember those moments and have them on your body to just say they mean a lot to me."
So, would Hemsworth ever get a matching tat with his good friend, Damon?
"I don't think we'd get matching tattoos," the Australian stud separately told ET on the 12 Strong premiere red carpet. "I'm done with tattoos. I got a couple and that's plenty. Too painful, mate."