“Fabulous secret powers were revealed to me the day I held aloft my magic sword and said ‘by the power of greyskull!’” the eldest Hemsworth brother captioned the photo of him and his youngest sibling.
Cyrus, 23, took on Madonna's 80s style with layers of pearl necklaces, a leather skirt and a t-shirt with the singers face on it.
Samantha Hemsworth, the birthday boy's wife, shared more snaps of the bash, including one of the couple them self, and a collage of polaroids.
Cyrus and Hemsworth have kept a low profile since reconciling earlier this year, however the singer did address her Neil Lanediamond engagement ring on a recent episode of the Ellen DeGeneres Show.
“This is really weird, because this is like real jewellery and most of my jewellery is made out of gummy bears and cotton candy … they don’t look that good together because they kind of mix up," she said.
"So sometimes I replace it with an actual unicorn or a Looney Tune. And [Hemsworth’s] kind of like, What’s going on? I am like, This isn’t really my aesthetic, but I’ll wear it because you love me.”
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