Here's the best "thanks for winning the World Cup" gift EVER ... Jennifer Lopez brought USWNT star Carli Lloyd on stage -- and proceeded to give her a SEXY lap dance!!!
It all went down Friday night at J-Lo's "It's My Party Tour" stop in New York City ... when the "Medicine" singer called for security to get Lloyd to the stage.
When Carli got up under the lights ... things took a very sensual turn -- 'cause Jennifer, pushing hair out of Lloyd's face, said, "I've got a little present for you.