Casamigos Tequila Party -- Everybody Who's Anybody Shows Up At Halloween Bash (PHOTOS)

Rande Gerber and Casamigos Tequila certainly know how to throw a Halloween party ... because it attracted way more stars than an awards show.

Celebs came out in droves Friday ... Paris Hilton, Jessica Alba, Serena Williams, Channing Tatum, David Spade, Maria Shriver and Kyle Richards, Cindy Crawford, Gwen Stefani, Lenny Kravitz, Fergie, Josh Duhamel, Seth MacFarlane, Sacha Baron Cohen & Julianne Hough to name a few.

Casamigos, co-owned by George Clooney, Gerber and Discovery Land CEO Mike Meldman, who dressed as golf pro Ricky Fowler (Ricky dressed as his caddy), made sure guests were appropriately liquified, with the help of a giant backyard bar.

We're told things remained pretty calm and everyone checked out around 12:30.

To be a fly on the wall ...