You can expect 2 things from GQ's Men of the Year party -- TONS of celebs, and all of them dressed to the nines.
We got a bunch heading into Thursday night's shindig at L.A.'s Chateau Marmont -- from "This is Us" star Justin Hartley and John Legend to Kate Beckinsale and Machine Gun Kelly.
Pics from inside the bash are crazy too ... Snoop, Kid Ink, Terry Crews, Matthew Broderick, Wiz Khalifa, and Jesse Williams are just some of the others who cleaned up for the party.