J Lo hit up South Beach Saturday night and partied at David Grutman's newest restaurant, Papi Steak. Grutman presented J Lo with a massive cake … it's the second one she scored in 2 days. The first was courtesy of her fiance, A-Rod. BTW, the cake sounds delicious from Divine Delicacies cakes — 5 tiers of chocolate — Godiva and Nutella. And, there's vanilla rum, coconut, guava cream cheese and other stuff. That's what $4k will get ya.