Monica, Rachel & Phoebe Why So Serious?

12/9/2016 7:16 AM PST

Courteney Cox, Jennifer Aniston & Lisa Kudrow Reunite for a Serious Dinner

Courteney Cox, Jennifer Aniston and Lisa Kudrow got the band back together and, for some reason, looked kinda sour at the end of the night.

The chick half of the "Friends" did dinner at Craig's in WeHo, and by the looks on their faces ... you'd swear they were discussing foreign policy or national security over the meal. Maybe they just weren't down for cameras -- Lisa couldn't wait to hop in her Porsche as she slipped out the back door.

Then again, every celeb knows photogs are part of the deal at Craig's.