Larsa Pippen's partying her 51st birthday weekend away ... getting close with her man Jeff Coby at a Miami club -- and, their relationship sounds super serious.
The reality television star hit up E11EVEN -- a multilevel nightclub in the downtown area of The Magic City -- around 1 AM Thursday morning ... bringing a whole entourage with her.
Larsa started her night on the red carpet with some ladies and then with Jeff -- before hitting the dance floor for a few drinks, a little dancing and a whole lot of birthday well wishes.