Look, it must be true, there's a picture and everything.
The 20-year-old - who is engaged to The Hunger Games actor Liam Hemsworth - took to her Twitter account to reveal she had taken the unusual festive present out for a drive in her car, and joked whether she would be allowed in a carpool lane, in which only vehicles with two or more passengers are permitted.
In a message to accompany a picture of her taking the doll for a spin, she wrote: "Does this count for the carpool lane? Such a nice Xmas gift (sic)"
Miley's new erotic doll is not the first time she has celebrated a special occasion with a naughty gift. In January, herself and Liam marked his 22nd birthday by chowing down on a penis-shaped cake.
Thankfully we don't have any pictures of that to hand. Merry Christmas, everybody!