Golden Globe Parties Why So Serious?

1/12/2014 7:28 AM PST

Golden Globe Parties -- Why So Serious?

We got a bunch of stars who were doing some pretty serious pre-Golden Globe partying, but it seems they all made a pact --- mum's the word.

Lots of stars were partying at Chateau Marmont and RivaBella in West Hollywood, including (in order on video) Leonardo Dicaprio, Demi Moore, Benedict Cumberbatch, Kate Mara, Amy Adams, Bob Saget, Rob Lowe, Garrett Hedlund, Jim Carrey, Michelle Dockery and Chris Hemsworth.

Almost to a person ... they smiled and practically said nothing. 

Maybe some of them were pissed, because we're told there were some pretty crazy private parties in big mansions Saturday night ... and here they were walking the streets.