Lil Wayne Surprises Girlfriend With Ring On Valentine's Day

Sources at Barton G restaurant tell TMZ, Weezy secretly handed wait staff a ring with a giant yellow rock on it during his meal -- and asked them to slip it inside the restaurant's signature sundae.

Moments later, after the dessert was delivered to his table, we're told Lil Wayne jumped up and shouted to the entire restaurant -- "SHE SAID YES!!!"

Sources tell us, everyone inside the restaurant believed the rapper had just popped the question. Weezy even tweeted later in the night ... saying again, "She said yes!" ... prompting millions more to think he had just gotten engaged.