The Spanish-born actress also shared a selection of photos from the party including one big group shot.
Joining Chris and Elsa were Chris' brothers Liam and Luke (the latter of whom donned a white Elvis jumpsuit costume) along with Liam's girlfriend Gabriella Brooks and Luke's wife Samantha.
Hollywood heavyweight Matt Damon, Channel Nine's Lauren Phillips and Josh and Sam Teskey from Melbourne folk band The Teskey Brothers, were just some of the others photographed as well.
Liam shared his own post from the event that featured a photo of himself, Chris and Josh Teskey as well as a short clip of Josh singing.
"Unforgettable experience with family and friends listening to @joshteskey sing. Love ya mate. @theteskeybrothers," the Hunger Games star captioned his post.
Though there weren't any photos shared of the two together, Liam's model girlfriend Gabriella shared some snaps and videos of herself at the party.
Dressed in a white Daisy Ltd. dress, the 24-year-old looked gorgeous!
Gabriella and Liam reportedly started dating in December 2019, just four months after he and Miley Cyrus announced their divorce.
Though Gabriella doesn't share much on social media in relation to her famous boyfriend, the 24-year-old did give a rare relationship update back in February and spilled to the Daily Telegraph how she stays grounded despite being all loved-up with one of the world's hottest hunks.
"I have a great support network who continually remind me of what's important," Gabriella told the publication.
"This is incredibly grounding."
Back in March, Chris and Elsa threw an extravagant 80s-themed bonanza in Sydney for their friend Aaron Grist's 37th birthday at Sydney hot spot Crown Towers but they weren’t the only big names in attendance.
Guests included Kate Ritchie, Matt Damon, Idris Elba and Liam Hemsworth.