Jeremy Piven Go See 'Entourage' ... I Buy You Popcorn!

6/4/2015 6:00 AM PDT

Jeremy Piven is a full service star ... he stars in movies, and then screens them with his fans and buys them all popcorn. 

Jeremy was at The Grove Wednesday night, grabbing some dinner before catching a showing of  "Entourage."  We suggested free popcorn would be a good idea and he wholeheartedly agreed.

Thing is ... Jeremy made good on his promise, which blew moviegoers away. 

He's leaving for England to shoot Season 4 of his hit TV show, "Mr. Selfridge," so from now on, you'll have to buy your own.