There's a BIG party going down in Sin City for the Big Game ... a Super Bowl watch party with stars from the 'Little Women' reality franchise mixing up drinks and pouring shots!!!
"Little Women: NY" star Little Jess tells TMZ ... she's bartending a ticketed event at the Nerd Bar on Fremont Street with two other reality stars, and there's an open bar.
Little Jess says the other bartenders include "Little Women: Dallas" star Tiffani and "Little Women: NY" star Jordanna James .