The "Wrecking Ball" singer was thrilled to receive a colorful new ring and other gifts from the 26-year-old actor on her 24th birthday Wednesday.
"Look at datttt Rainboooowwwwwwww rock! You always know how to make my 'grubby little kid fingers' *SHINE!*!!! (P.S. please take notice of that beautiful packaging!!!!)," she captioned a photo of her new jewelry.
"Best bday evaaaaaa!!!!!!! Thank you my loooooove," she added to a picture of herself with flowers and balloons.
"It's very weird because this is, like, real jewelry and most of my jewelry is made out of, like, gummy bears and cotton candy, and they don't look that good together because they kind of mix up," she told DeGeneres.
"Sometimes I, like, replace it with an actual, like unicorn or a Looney Tune and he's like, 'What's going on?' It's like, 'Well, this isn't really my aesthetic but I'll wear it because you love me,'" the star said.
Cyrus joined Hemsworth at his brother Luke Hemsworth's 80s-themed birthday party this month. The singer last released the album Miley Cyrus & Her Dead Petz in August 2015.