Liam Hemsworth and Miley Cyrus Party With Pals at Gold-Themed Bash -- and Nail Their Looks

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Miley Cyrus and Liam Hemsworth go for the gold!

Amid all the Summer Olympic festivities, the couple celebrated the birthday of Samantha Hemsworth, Luke Hemsworth's wife, with a gold-themed party, which included a giant gold horse. Really committing to the theme, Liam, 26, wore a Gold's Gym tank-top and gold shorts. Miley, 23, also went the athletic route, donning a gold medal and a matching basketball jersey.

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Flaming Lips frontman and Cyrus' tourmate, Wayne Coyne, wore gold horns to the party, but it was Liam's brother that nailed his costume. "@thesamanthahemsworth 's birthday," Luke captioned a photo of his epic outfit. "I think the theme was "Gold"? I even had gold mankini on underneath."

Miley seems to fit right in with The Hunger Games star's family. In April, she even got a matching finger tattoo with Chris Hemsworth's wife, Elsa Pataky.

Other stars at the party included Zac Efron and pro surfer Kelly Slater.

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Last week, Liam and Miley inspired some serious relationship goals when they did their own version of "Carpool Karaoke" and sang along to Justin Bieber's "Love Yourself." Check it out: