Tiffany Haddish got up close and personal with Usher this weekend -- receiving the serenade treatment that also teetered into touchy-feely territory.
The actress/comedian was in attendance for Usher's Vegas residency show Friday night, where she had a great seat toward the front ... but which got a whole lot better when he and his team actually invited her up onstage.
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Seems like he knew she was in the crowd and wanted to giver something special ... she got it and then some. Check out the video -- TH looks like a kid in a candy store up there.
As you can see ... Usher did a little dance with Tiff, grinding up on her backside and her totally leaning into it. He's also singing to her -- and eventually, has her sit down on a table on stage as they begin to act out a skit. Tiffany's a pro, so she rolls with it all to a T.