Beyonce's letting it all hang out!

The sexy mama decided to ditch her bra for lunch with hubby Jay Z ... uh, what marriage trouble?!

The pair dined on vegan fare at Gracias Madre in West Hollywood but we have a feeling Jay was paying more attention to his wife than to the food ...

The pop goddess wore her hair in loose curls and wore a denim pencil skirt with a chambray button down -- completely unbuttoned -- carrying a black leather bucket bag. Guess Bey was feeling frisky today!

Knowles recently announced she'd launch a vegan food delivery service so maybe she was doing some research for her new business, loading up on some of the best healthy meatless food in LA.

Hey, Queen Bey is living proof that you're not starving yourself by eating vegan -- you can still keep your voluptuous curves! Lawd have mercy!