Juicy J.Lo’s Puffy Party!

Jennifer Lopez got a little puff of the past when she partied up a storm with ex Sean “Diddy” Combs!

The two reunited at an awards show after-party while J.Lo’s current squeeze, Casper Smart, stood nearby. A source told The National ENQUIRER: “Everyone seemed to enjoy ‘the Puffy days’ reunion — except Casper!”

J.Lo’s rep insisted she interacted with Diddy for just minutes, and Casper wasn’t upset. But the boozy get-together reminded fans of when Jenny from the Block dated the Puff Daddy rapper from 1999 to 2001.

Added the source: “The champagne flowed and Sean made Jenny crack up a few times with some inside jokes. But Casper was happy when he and J.Lo finally went home!”