Jessica Simpson -- Mama Knows How to Party! (VIDEO)

Jessica Simpson is a 34-year-old married mother of two, so she doesn't hit the town every night anymore -- but when she does, SHE HITS IT HARD!

Simpson needed a lot of support on her way out of The Sayers Club in Hollywood Tuesday night -- and by support we mean ... if it wasn't for hubby Eric Johnson, she probably wouldn't have made it to their car.

Check it out ... Jessica's bizarre interest in a puddle, which Eric expertly helped her avoid, is awesomeness.

This mommy-night-out stumble fest is only surpassed by the epic one Jess gave us last summer on her way out of a different nightclub. Good times, indeed.