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Tobey Maguire, Leonardo DiCaprio

Hubert Boesl/picture-alliance/dpa/AP Images

Leonardo DiCaprio and Tobey Maguire are friends through it all.

The Oscar winner and his newly single, longtime best friend turned Mike Meldman's Casamigos Halloween Party into a guys' night out!

Leo and a group of friends all wore jeans, flannel shirts, wolf masks and wolf glove, an eyewitness tells E! News. Tobey, on the other hand, was dressed in regular clothes and some sort of green, monkey mask. Leo and Tobey, who recently separated from wife Jennifer Meyer, didn't arrive together, but an onlooker says they literally ran to greet each other with a warm hug when they spotted each other at the fete.

Leo DiCaprio

AKM-GSI

Tobey was a bit more subdued than Leonardo, who was reportedly the life of the party. The actor, still wearing his wolf mask, was seen running downstairs and jumping right onto the dance floor. He appeared to have a blast dancing with strangers and stayed at the party well past 2 a.m.

Other attendees at the Casamigos bash included Hilary Duff, Jason Walsh, Gerard Butler, Ali Larter, Hayes McArthur, Lauren Conrad, Hayley Duff, Jenna Dewan Tatum, Ryan Lochte, Kayla Reid, Alessandra Ambrosia, Molly Sims, Zach Braff and James Corden.