David Ortiz -- Meet My Personal Champagne Handler ...

When you chug a $100,000 bottle of champagne, you don't just discard the bottle, you carry it around with you ... or if you're David Ortiz, you get a woman to lug it around for you.

The Red Sox hero was strolling into "David Letterman" yesterday ... followed by a champagne handler who carried the 15 litre bottle of Armand de Brignac Nebuchadnezzar Champagne (also known as "Ace of Spades") Ortiz pounded after the World Series.

Can't give the guy too hard of a time though -- 'cause after the show, he was his typical friendly self ... and even posed for pics with some NYPD officers.

What rivalry?