Miley, who is goddaughter to the "9 to 5" hitmaker, took to Instagram to share three clips of her doing her best Dolly impression, as she penned in the caption, "Happy Birthday Aunt Dolly!!!!!"
The clips are taken from a 2017 episode of "The Tonight Show Starring Jimmy Fallon", where the "Wrecking Ball" star and Jimmy Fallon dressed as Dolly and Kenny Rogers, respectively, to recreate the classic "Islands in the Stream".
In the first two clips taken backstage, Miley can be seen putting on the final touches of the outfit that she wore on the show, including a platinum blonde wig, tiny black dress and a pair of extra-large breast enhancements - which she playfully drew attention to as she showcased the look.
Miley also shared the original Kenny and Dolly performance in her Instagram post, in a special tribute to her godmother.
Dolly is a longtime friend of Miley's dad Billy Ray Cyrus, and told SiriusXM host "Just Jenny", "When Miley came along, I said, she's got to be my fairy goddaughter."
The singers have since collaborated for several live performances, and appeared together on the tune "Rainbowland" on Miley's 2017 album, "Younger Now".