The actress-and-singer spent the festive season with her family in Nashville, Tennessee, and couldn't resist taking to her 10-year-old sister Noah's new karaoke machine to belt out her recent hit 'Can't Be Tamed'.
Miley's sister Brandi, 23, tweeted: "Miley and noah are currently singing "can't be tamed" on noah's new karaoke machine. It's pretty hilarious.
"my Mom is videoing . maybe if you're lucky i'll snag it and upload. (sic)"
The 18-year-old star - whose singer father Billy Ray Cyrus filed for divorce from her mother Tish in October - also posted a Christmas message to her fans, saying she hopes to "make people happy" throughout the coming year.
The 'Last Song' said: "I want to make this the year that I go out and do what I'm here to do and that's to help people and make people happy."